Mathematics High School

Help????? I don’t know which is right

Answers

Answer 1

Answer:

Step-by-step explanation:

Given

tanθ = [tex]\frac{1}{2}[/tex] = [tex]\frac{opposite}{adjacent}[/tex]

This is a right triangle with legs 1 and 2

Using Pythagoras' identity

hypotenuse² = 1² + 2² = 1 + 4 = 5 ( take square root of both sides )

hypotenuse = [tex]\sqrt{5}[/tex]

θ is in the 3rd quadrant where sinθ < 0 , then

sinθ = [tex]\frac{opposite}{hypotenuse}[/tex] = - [tex]\frac{1}{\sqrt{5} }[/tex] ← rationalise the denominator

= - [tex]\frac{1}{\sqrt{5} }[/tex] × [tex]\frac{\sqrt{5} }{\sqrt{5} }[/tex]

= - [tex]\frac{\sqrt{5} }{5}[/tex] → C

Related Questions

help me! I’m behind in school if you do I’ll give you extra points and stars. I’ll give you a good report.

Answers

Answer:

The answer is D, approximately 6.8

Step-by-step explanation:

(I'm gonna be honest, I just looked it up)

Answer:: D I’m not sure tho but I hope it helps

in dividing or subracting three real numbers, does the order matter

Answers

Answer:

Yes because you would need to divide first before subtracting

Step-by-step explanation:

Answer:

yes, because of PEMDAS

divison always comes before subtraction

Which order pair could represent the location of point h

Answers

What does the work look like first

Notebook costs $5,write an expression to show how much (n) notebook costs.

Answers

To find the total cost you would multiply the cost of a notebook by the number of notebooks purchased:

Total = 5n

A research submarine dives at a speed of 100 ft/min directly toward the research lab. How
long will it take the submarine to reach the lab from the surface of the ocean?
It will take minutes for the submarine to reach the lab from the surface of the ocean
(Round to one decimal place as needed.)

Answers

Answer:29.2

Step-by-step explanation:

Answer:29.2m

Step-by-step explanation:

$55,000 at 16% compounded
semiannually for 2 years

Answers

hope Answer:

74.826.89

Step-by-step explanation:

hopefully helps

Answer: equation for compound interest A=P(1+r/n)^nt

Answer: $74,826.89

Step-by-step explanation: Fill in the numbers for the formula!

plz give some one answrer

Answers

Answer:

x=120 (opp. angles of //gram)

Step-by-step explanation:

Because DA//CB and AB//DC (given)

Therefore ABCD is a parallelogram (opp. sides equal)

Therefore,

∠DAB = ∠DCB (opp. ∠s of //gram)

x = 120

Solve for C.
Thank you to whoever answers!!!!!!!!!!!!!!!!!!!

Answers

Answer:

c=7

Step-by-step explanation:

How to solve your problem

8=−3+29

8=−3c+298=-3c+298=−3c+29

Solve

Subtract

292929

from both sides of the equation

8=−3+29

8=−3c+298=-3c+298=−3c+29

8−29=−3+29−29

8−29=−3c+29−298{\color{#c92786}{-29}}=-3c+29{\color{#c92786}{-29}}8−29=−3c+29−29

Simplify

Divide both sides of the equation by the same term

Simplify

Solution

Hope this helps!

Have a great day!

-Lea

First we add 29 to both sides. 29+8=37
Our new equation is 37=-3c then we divide by three on both sides.
Your answer is 37/3

solve by substitution y=3x+5 and y=x+1

Answers

Answer:

x= -2 y= -1

Step-by-step explanation:

To solve by Substitution you would make this equation equal to each other x+1=3x+5 from there you would solve for x subtract x on both sides. and subtracting 5 from both sides 2x= -4 then divide by 2 to get x by itself x=-2 since we now found what the value of x is you can now plug in x into one of the origunal equations and get your answer for y which is y=-1

Evaluate 7 with an exponent of -2

Answers

Answer:

7 x -7 = -49

Step-by-step explanation:

To solve 7 to the power of -2 we multiply 7 by -7.

(っ◔◡◔)っ ♥ Hope It Helps ♥

The value of 7 with an exponent of -2 is 1/49 .

Given,

7 with an exponent of -2.

Now,

Let us simplify the given statement.

[tex]7^{-2}[/tex] = 1/7²

Value of 7² is 49.

Thus the value of 7 with an exponent of -2 is 1/49 .

Know more about exponent,

https://brainly.com/question/602904

#SPJ6

First correct answer will get Brainliest - due today

Dora has three candles, which will burn for 3, 4 and 5 hours, respectively. If she wants to keep two candles burning at all times, what is the greatest number of hours she can burn the candles? (Dora has a clock that she can use to time the candles.)

Answers

Answer:

3 hrs 38.2 min, Candle 2 will be three times the length of candle 1

Step-by-step explanation:

If Dora burns candles that burn for 4 and 5 hours they burn for 9 hours combined one after another.

What are permutation and combination?

In arithmetic, combination and permutation are two different ways of grouping elements of a set into subsets. In combination, the components of the subset can be recorded in any order. In a permutation, the components of the subset are listed in a distinctive order.

here,
Dora has three candles, which will burn for 3, 4, and 5 hours,
The combination of the hours of burning,
3 + 4 = 7 hours
4 + 5 = 9 hours
3 + 5 = 8 hours

Thus, if Dora burns candles that burn for 4 and 5 hours they burn for 9 hours combined one after another.

Learn more about permutations and combinations here: https://brainly.com/question/2295036
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Izzy is saving up for a road trip that is happening6 weeks from today. At this moment, Izzy has $90 in her savings account. She plans on saving $25 a week.

Answers

Answer:

$210

Step-by-step explanation:

Given data

time = 6 weeks

initial amount= $90

saving per week = $25

Hence the expression for the total savings after the 6 weeks is given as

y= mx+c

where

m= $25

x= 6 weeks

c= $90

substitute

y=25*6+90

y= 150+60

y= $210

Hence the total amount after 6 weeks is $210

PLEASE HELP ME!! I WILL GIVE BRAINLIEST. ITS DUE IN AN HOUR

Answers

Answer:

1. c/5=3.25

2. 16.25

Answer:

The last box.

Step-by-step explanation:

The "c/5" means c divided by 5.

NEED HELP WITH THESE

f(x)=x^2-x+1
g(x) = 5 - 3x

Evaluate the following.
1) f(-1)
2)g( -8)
3)f( 1)
4) g(5)
5) f(3)
6) g(-3)

Answers

Step-by-step explanation:

1 .f(x)=[tex]x^{2}[/tex]-x+1

f(-1)= (-1)-(-1)+1

f(-1)= 1+1+1

= 3

3.f(x)=[tex]x^{2}[/tex]-x+1

f( 1)=(1)-1+1

f( 1)=1-1+1

5. f(x)=[tex]x^{2}[/tex]-x+1

f(3)=[tex](3)^{2}[/tex]-3+1

= 9-3+1

2. g(x) = 5 - 3x

g( -8)=5-3(-8)

g( -8)=5+24

=29

4.g(x) = 5 - 3x

g(5)=5-3(5)

g(5)=5-15

=-10

6.g(x) = 5 - 3x

g(-3)=5-3(-3)

g(-3)=5+9

=14

Please help me I’ll mark brainliest:)

Answers

Answer:

x = 4

Step-by-step explanation:

answer: x=4

explanation: use the pythagorean theorem.
5^2= x^2 + 3^2
25=x^2+9
16=x^2
x=4

At a sale, a camera was reduced by $8. This represented 10% of the
original price. On the last day of the sale, the camera was sold at 75% of
the original price. What was the final selling price?

Answers

Answer:

The answer is 60.

Step-by-step explanation:

1. 8*10=80 #original price

2. 80.....100%

x...... 75%

=> 100x = 6000 => 60

HELP WILL GIVE BRainlist 20 points

Answers

Answer:

11. x = 5

12. x = 24

Step-by-step explanation:

11.

8x° + 140° = 180°

(Linear pair angles)

8x° = 180° - 140°

8x° = 40°

x ° = 40°/8

x° = 5°

x = 5

12.

2x° + 42° = 90°

(complementary angles)

2x° = 90° - 42°

2x° = 48°

x ° = 48°/2

x° = 24°

x = 24

Explain why dividing each side of \small 3x^2=6x by \small 3x is not a reliable way to solve the equation.

Answers

Answer:

See Explanation

Step-by-step explanation:

Given

[tex]3x^2 = 6x[/tex]

Required

Why dividing by [tex]3x[/tex] is not reliable

The reason is that, the given expression is a quadratic equation and as such, it will most likely have two solutions.

So, when the expression is divided by [tex]3x[/tex], the solution will be [tex]x = 2[/tex], leaving out the other possible solution.

The right way is:

[tex]3x^2 = 6x[/tex]

Subtract 6x from both sides

[tex]3x^2 - 6x = 6x - 6x[/tex]

[tex]3x^2 - 6x = 0[/tex]

Factorize

[tex]3x(x - 2) = 0[/tex]

Split

[tex]3x = 0\ or\ x - 2 = 0[/tex]

Solve for x in both cases:

[tex]x = 0\ or\ x = 2[/tex]

Help me..............

Answers

Answer:

the answer is 30 I hope this helps

25 ft 8 yd 11 in.
Which is greater?

Answers

Answer:

25 ft

Step-by-step explanation:

8 yd = 24 ft

11 in < 1 ft

8 yd < 25 ft

Find the Mean of the data set 3,3,4,5,6,7,7

Answers

Answer:

Step-by-step explanation:

3+3+4+5+6+7+7 = 35

35/7 = 5

This is 7th grade math just trying to see if I’m doing it right so I need this answer please hurry

Answers

Answer:

I assume you are trying to find the area of it, then it would be 182m.^2

what percent of 98 is 74

Answers

Answer:

75.51%

Step-by-step explanation:

hopefully this helps

x/100 = 74/98

98x = 7,400

x = 7,400/98

× = 75.51 % of 98

While teaching at the University of Pisa in 1589, Galileo tested Aristotle’s laws of falling objects by dropping large metal projectiles off the?
.A university building
B. church tower
C. Leaning tower of Pisa
D.Eiffel Tower
He concluded that a heavier object dropped from the same height as a lighter object will land?
A. before the lighter objects lands
B. after the lighter objects land
C. at about the same time as the lighter objects

Answers

Answer:

C. Leaning tower of Pisa and C. at about the same time as the lighter objects

Step-by-step explanation:

Answer:

Leaning Tower of Pisa

at about the same time as the lighter objects

Step-by-step explanation:

100 on edge

Help pls!! Find the value of x and the measure of angle C

Answers

Answer:

x= 34, <C = 126°

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

I didn't work it out...I just put the value of x in each option till I got angle c correct...and the only one that worked was the third option

If the interest 4,000 for 4 years is 1,280 what is the interest rate

Answers

Answer:

For example, with a $4,000 deposit and an annual interest rate of 8 percent, the simple interest after four years would be $1,280. This is calculated by multiplying the principal (P) by the rate (R) and by the rate of time (T): 4,000 x 0.08 x 4 = 1,280.

Step-by-step explanation:

I hope the answer help you

g(n) = 1 + 3
h(n) = -n -1
Find: (g/h)(-5)

Answers

Answer: look at the picture

Step-by-step explanation: Hope this help :D

-Let solve for g

g/h=-5

Step 1: Multiple both sides by h.

g=-5h

Answer: g=-5h

5(4x+1) what is it?

Answers

Answer:

20x+5

can I get brainiest

Step-by-step explanation:

Answer:

20x+5

Step-by-step explanation:

Distribute

5 ( 4 + 1 )

2 0 + 5

when I need to reduce the number by 13%, just multiply it by the number ...

Answers

Answer:

0.87

Step-by-step explanation:

Consider the triangles.

Triangle C D E. Angle C is blank, angle D is 87.3 degrees, angle E is 35.5 degrees. Triangle R S T. Angle R is blank, angle S is 57.2 degrees, angle T is 87.3 degrees. Answer the questions about these triangles. What is the measure of angle C? Which angle corresponds to angle C? What can be concluded about the triangles?

Answers

Answer:

C = 57.2

Angle S corresponds to angle C

Both triangles are symmetrical to each other.

Answer:

What is the measure of angle C?

57.2

Which angle corresponds to angle C?

angle S

What can be concluded about the triangles?

The triangles are similar.

Step-by-step explanation:

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