Mathematics Middle School

WILL GIVE BRAILIEST: 8th grade: equations and geometry


help please!!!! also please explain how to solve equations with different variables in it (like 2k+3x= 30)

WILL GIVE BRAILIEST: 8th Grade: Equations And Geometryhelp Please!!!! Also Please Explain How To Solve

Answers

Answer 1
That’s should he right but also it could of been 54
Answer 2

Answer:

C. j=2 and h=4

Step-by-step explanation:

Step 1: Create a system of equations for your problem based off what we know.

- we should know that the equation to find the perimeter of something is

[tex]P= 2l+2w[/tex] where P is the perimeter, l is the length, and w is the width.

- we know that the perimeter of Rectangle P is 20 inches and that the perimeter of Rectangle Q is 30

- we know the length and width of both rectangles

Using this information, lets set up our system.:

[tex]\left \{ {{20=2(j+4)+2h} \atop {30=2(3h)+2(j+1)}} \right.[/tex]

Step 2: Using the top equation we're going to try to solve for one of the variables. I chose to solve for variable j.

[tex]20=2(j+4)+2h[/tex]

Start by distributing 2 into j + 4.

[tex]20=2j+8+2h[/tex]

Now subtract 8 from both sides of the equation.

[tex]12=2j+2h[/tex]

Now isolate variable j by subtracting 2h from both sides of the equation.

[tex]12-2h=2j[/tex]

Now condense the equation into simple terms by dividing both sides by its GCF 2 then reorder to get j on the left.

[tex]j=6-h[/tex]

Step 3: Now that we solved for variable j we can now substitute j into one of our equations from the original system. I chose to use the bottom equation and chose to distribute it before substituting.

[tex]30=6h+2j+2[/tex]

Subtract two from both sides to isolate the variables

[tex]28=6h+2j[/tex]

Now we can plug j into our equation

[tex]28=6h+2(6-h)[/tex]

Step 4: Distribute 2 into 6-h

[tex]28=6h+12-2h[/tex]

Step 5: Combine like terms

[tex]28=4h+12[/tex]

Step 6: Subtract 12 from both sides of the equation

[tex]16=4h[/tex]

Step 7: Divide both sides by 4

[tex]4=h[/tex]

Now that we know that h=4 we can plug 4 into one of our earlier equations. I used j=6-h

[tex]j=6-4\\j=2[/tex]

Plug answers into either one of the original equations to check answer

Related Questions

can someone explain how to do this, I don't want the answer?

Answers

The table is filled out by following these steps:

Step 1) Pick any number you want for x. Usually small values work such as x = 0, but you can choose anything you want. Be sure it fits within the window of the graph.Step 2) Replace x with that number you picked. If you picked x = 0, then y = (1/3)x becomes y = (1/3)*0 = 0. Meaning x = 0 leads to y = 0. The point (0,0) is on the graph.Step 3) Go back to step 1 and repeat the process with other x values. I recommend picking multiples of 3 so you can avoid fractional values of y.

Follow those steps listed above so you can fill out the table. Each row of the table generates a different (x,y) point on the graph. Then draw a line or curve through the points. In this case, it's a straight line.

This straight line has a slope of 1/3 because y = (1/3)x is in slope-intercept form y = mx+b where,

m = 1/3 = slopeb = 0 = y intercept

A slope of 1/3 means "go up 1, over to the right 3" when hopping from point to point along the line.

The unit rate and slope are the same thing when it comes to linear equations.

You have the slope already, you need to find the unit rate with the slope, you just have to put 1/3 in the graph and use rise/run

How do find volume of the triangular pyramid, I’m so confused I need the formula as well ASAP,!!,, please thanks so much

Answers

Answer:

5100

Step-by-step explanation:

20 x 17 x 15 = 5100. hope this helps you!!!

also formula is 1/2 x b x h x l

Left up down right left shake

Which interval contains the most data values?
Answer Choices Below:


170-179


120-129


160-169


140-149


130-139


150-159

Answers

170-179 because there is a higher number interval
170-179 because there is a higher number interval

I WILL GIVE BRAINLIEST IF ANSWERED CORRECTLY! 4.
Use the following images to answer the question:

a. Write a truth statement about each picture using Euclidean postulates.
b. Write the matching Euclidean postulate.
c. Describe the deductive reasoning you used.4.
Use the following images to answer the question:

Answers

Answer:

wut is this even supposed to be???

Step-by-step explanation:

Yeah I didn’t get it when ever I read it to

There are 240 ounces of sports drink left in the cooler at the end of one practice.

Every player had some sport drink from the cooler. Based on the equation, y = 648 -24x, how many players were at practice?

Answers

Answer:

there were 17 players left on the pitch

Step-by-step explanation:

17x24=408

648-408=240

Answer:

there were 17 players left on the pitch

Step-by-step explanation:

17x24=408

648-408=240

turn this fraction into a decimal 17 23/32

Answers

Answer:

The answer should be 18.

Step-by-step explanation:

Divide the numerator by the denominator: 23 ÷ 23 = 1

Add the number you got to the whole number: 17 + 1 = 18.

Therefore: 18 is your answer.

This is the answer 53.84375

identify the slope and y-intercept of the function y= -5x+4

Answers

Answer:

The slope is -5 and the y intercept is (0,4). (D).

Step-by-step explanation:

The formula for this is y=mx+b. With m equaling the slope, and b equaling the y intercept. In the place of m, there is -5, getting you your slope of -5 and in the place of b there is 4 (meaning the coordinate (0,4)), getting you your answer. I hope this helps! :)

Answer: D

Step-by-step explanation: slope= -5 & y-intercept= (0,4)

Please, I need help with this question

Answers

Answer:

12 square units

Step-by-step explanation:

The answer might be a little easier to see if we slide that triangle on the left over to turn this shape into a rectangle! This is a technique you can apply to any parallelogram. Looking at the newly constructed rectangle, we can find its area by multiplying its length (2) and width (6) for an area of 2 · 6 = 12 square units.

Answer:

12 units squared

Step-by-step explanation:

Formula for area of a parallelogram:

A = b • h

The base of the parallelogram is 6 units. The height of the parallelogram is 2 units. Multiply the two numbers together. 6 • 2 = 12 units squared.

!!50 POINTS!! Better Buy?
You are planning an end of the year party for your math class. Your teacher needs to help deciding which products are the better buy.
Directions: Determine the unit rate for each brand and determine what is the best purchase item. !!SHOW WORK!!
(If you help with this please check out my profile for more questions that need answers by TOMORROW!)

Answers

Answer:

The best buy item is the Frito-Lay mi Variety Pack. Going for only 0.35 per item.

Step-by-step explanation:

All I did was the equations and then I compared the answer, the lowest answer is the best buy since it is the lowest price found.

Frito-Lay:

9.88/28 = 0.35

Unit rate is 35 cents

Pringles:

6.48/18 = 0.36

Unit rate is 36 cents
Pack of 18:

11.21/18 = 0.6

Unit rate is 60 cents

Pack of 24:

15.85/24 = 0.66

Unit rate is 66 cents

GC:

14.75/30 = 0.49

Unit rate is 49 cents

Sweet Treats:

10.75/25 = 0.43

Unit rate is 43 cents

Comparing all of this data, it can easily be seen that the Frito-Lay mi Variety Pack is the best deal you can find out of these 6 deals.

Answer: Frito Lay mi Variety Pack

Type a digit that makes this statement true.

8,159,85
is divisible by 2.

Answers

Answer:

8,159,852

Step-by-step explanation:

when you divide 2 and 8,159,852 you get 4,079,926 without a remainder.

Answer:

all even numbers are fine(2,4,6,8)

Step-by-step explanation:

Type a digit that makes this statement true.

8,159,85_

is divisible by 2.

all even numbers are fine

(2,4,6,8)

A book store is hosting a special night in which families can enjoy a story and craft time. Tickets to the
event must be purchased ahead of time and are $1.50 for children and $2.50 for adults. So far, 45
children's tickets have been sold, which is 60% of the total tickets sold. How many tickets have been
sold so far? Show your calculations or explain how you got your answer.

Answers

Answer:

75 total tickets

Step-by-step explanation:

METHOD 1:

We know that 45 children's tickets have been sold, being 60% of the total tickets having been sold.

So, basically, we solve for x:

We have, 60% × x = 45

or, 60/100 × x = 45

Multiplying both sides by 100 and dividing both sides by 60,

we have x = 45 × 100/60

x = 75

If using calculator, enter 45x100/60, which will give you the answer.

------------------------

METHOD 2:

Division is the opposite of multiplication

Start with the formula to calculate the percentage of total

y=value÷ percentage/100

Substitute values in the equation

y=45÷60/100

Simplify and solve

y=45÷0.6

y=75

Both methods give you 75, therefore 75 tickets have been sold

So your supposed to do 1.50/1 x 60% which is 90

Medal award ceremonies are held after each event. The following three flags are used to represent the gold, silver, and bronze medal winners. Gold Silver Bronze 1. Using the flags, create a tree diagram to show the possible arrangements of the three medal flags. PLEEZE HELP MEEEEEEE :(

Answers

Answer:

Step-by-step explanation:

Having the information on how many events there are and how many people in each event there would help me personally solve this

what i can tell you is its a probability thing a tree diagram is starting with something, like flipping a coin, and creating a branch for heads and tails, 0.5 for each branch. like the attachment I have on here. there's only 2 probable results from a coin, but if I have 5 events with 50 competitors I've created a lot more probable outcomes, it also depends on the events, if one of my competitors in 6'9" and ones 5'2" and the event is a dunk contest it would be slightly unfair and the probability of the person who is 5'2" changing your tree diagram :)

Type of math is this in middle school but I think it’s 8m

?????? I don’t get it

Answers

Answer:

His gain was greater on the first play because if you convert 2 yards to feet you get 6ft and 6 feet is greater than 5 feet which means the football player had a greater gain on the first play.

Step-by-step explanation:

1 yard is 3 ft

2yards x 3=6 ft

6ft> 5ft

first play> Second play

6ft>5ft is the answer

Graphing should be considered a method of _________

Answers

Math is the answer to the question
The answer to the question is math


Explanation:

Because you can only use graphs in math

pls answer I will mark brainliest

Answers

Answer: 147 cm²

Step-by-step explanation:

   Since it says to use 3 for pi, and the radius is given to us (7 cm), we will plug in and solve for the area.

A = πr²

A = (3)(7)²

A = 147 cm²

the answer is 147 cm^2

25 POINTS!!!
A map of a town has no scale. You know that the distance between the post office and the park is 2 mi. On the map it is 2 in. Also, on the map you know the distance from the park to the school is 8 in. What is the actual distance in miles between the park and the school?
A. 0.5 mi.
B. 4 mi.
C. 8 mi.
D. 16 mi.

Answers

The answer is C

If you are given a 2 inch distance from the post office to the park and it’s known that 2 inches= 2 miles and you also know that the distance from the park to the school is 8 inches which is 4 times more than the distance from the post office to the park then you know that the amount of miles will be 4 times more than 2 miles so, 4x2=8 which means that the distance between the park and school is 8 miles.

Hope that makes sense :))
It’s eight miles, as you can see 2 miles = 2 inches which means every inch is one mile, so eight inches means eight miles! Hope this helps.

Type a digit that makes this statement true.
7,748,00
is divisible by 6.
Submit

Answers

Divisible rule of 6 is " The number must be divided by 2 and 3 " so answers are 774810,774840,774870.

Answer:

Divisible rule of 6 is " The number must be divided by 2 and 3 " so answers are 774810,774840,774870.

Step-by-step explanation:

Need help as soon as possible for all of these questions

Answers

Answer:

It seems like everything is correct but I wouldn't be for sure.

But if you think everything is not right, then don't listen to me lol-

I hope I helped  ^^

Answer:

I can tell u two

Step-by-step explanation:

1st one is b

3rd is b

4th is b

H

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please help I have so much work God ​

Answers

Answer:

this is a find the shapes with 4 sides

Step-by-step explanation:

i did this my self

I can’t understand this question

Gabriel worked for 19.5 hours helping his grandfather at his auto shop. If Gabriel was paid $497.25, how much did he earn per hour?

Answers

Answer:

25,5

Step-by-step explanation:

i divided the money in the hours

He made $25.05
You just divide $497.25 by 19.5.

pls answer I'll mark brainliest

Answers

Answer:

Step-by-step explanation:

so in order to find the surface are of square and rectangle we have this formula square =a^2


Some of the rectangles are 11*5 = 55

And for the squares they are 2*5=10


But we have 2 rectangle with 2*11=22

Basically just add them up and the answer is 174m^2

174.

the L of the main rec is 11x14 the side boxes both have an area of 10. add all up and you get 174

Find the volume of the cone. Round to two decimal places

Answers

Answer:

564.44

11*7 squared                    

Answer:

V = 564.15 ft^3

Step-by-step explanation:

The formula for the volume of a cone of base radius r and height h is

V = (1/3)(pi)(r^2)(h).  Here, r = 7 ft and h = 11 ft, and so the volume of this particular cone is

V = (1/3)(3.14)(7 ft)^2*(11 ft), or V = 564.15 ft^3

The amount of sports drink in a cooler during practice is modeled by the equation y = 648 -24x

y = the number of ounces in the cooler after practice
x = the number of players at practice who take drinks from the cooler

What does the Y-INTERCEPT mean?

Answers

When x is 0 what’s the y , is that what u r asking
The answer would be C. Because it is asking what the Y intercept means. They tell us y= the number of ounces in the cooler after practice. We do not know how much the kids drank, but they do tell us X=the number of players who take drinks from the cooler. Since the question is 24X we can assume the 24 means the amount the students drank. If we solved that, we would know how much was left after practice which is what Y is asking us. So the answer is C because it tells us what the Y intercept means (Each person drank approximately 24 OZ of water at the practice. 648-24x)

Hope this helps!

During a sports competition, students participated in races of various distances. The data is shown in the frequency table. What is the range of lengths of the various races? A. 500 m B. 1000 m C. 900 m D. 400 m

Answers

Answer:

B

Step-by-step explanation:

this is the answer but work out the question and you will see how to answer more questions like this

B is the answer so you need to learn how so for future you can do em

A hybrid car can travel 484 miles on 11 gallons of gas. What is the unit rate in miles per gallon? (FIRST ANSWER GETS BRAINLIEST)

Answers

Answer:

..................................

about 44

The answer to your question is 44.

Survey results state that 80% of people enjoygoing to the beach. The random numbers belowrepresent 10 trials of a simulation of asking twopeople if they enjoy going to the beach, usingthe numbers O through 9 for their responses.86 5422094053 07 6556 15Let the numbers fromtorepresentpeople who enjoy going to the beach.Let the numberstorepresent peoplewho do not enjoy going to the beach.Based on the simulated results, the probabilitythat exactly one of two people enjoys going tothe beach is or %

Answers

Answer:

Based on the simulated results, the probability that exactly one of two people enjoys going to the beach is 0.3 or 30%

Step-by-step explanation:

si pero todavía vamos que vamos a comer a la playa de comer hoy ballena fría en la mañana

A: the result of andre's first step was -x+6= -8

B: the result of diego's first step was 6 = x-8

Answers

Answer:

Andre subtracted 3x from both sides while Diego subtracted 2x from both sides

Step-by-step explanation:

andre - 3x and diego - 2x on both side

can someone help me pls

Answers

equation: 3.773×104

answer: 137730
equation: 3.773×104
answer: 137730

HOPE THAT HELPS!!

Please answer this addition problem.
What is 485+352?

Answers

837 is the right answer to the problem
The correct answer is 837

PLEASE HELP 20 POONTS! Of the students at Creekview Middle School, 30% are in 6th
grade, 30% are in 7th grade, and 40% are in 8th grade.
What is the estimated probability that at least one of the
next three students entering the school will be a 6th
grader?


Here are the results of a simulation using a random number generator.

Let 7, 8, 9 0 = 8thg

Let 4, 5, 6 = 7th grader

Let 1, 2, 3 = 6th grader

Answers

Answer:

A

Step-by-step explanation:

You look for groups with the number 1,2,3 in

The answer is A if you don’t need an explanation
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