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4 years ago

6

Triangle XYZ is shown on the coordinate grid

1 answer:

pav-90 [236]4 years ago

7 0

Answer:

1,2,5

Step-by-step explanation:

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ΔABC has three sides with these lengths: AB = 9, BC = 40, and CA = 41. What is the value of cos C?

kotykmax [81]

Answer:

$cos(C) =\frac{40}{41}\\\\cos(C)=0.976$

Step-by-step explanation:

To find the $cos (C)$ we must use the cosine theorem.

The cosine theorem says that:

$c^2 = a^2 +b^2 -2abcos(C)$

In this case:

$c=AB = 9$

$b=CA = 41$

$a=BC = 40$

So

$9^2 = 40^2 +41^2 -2(40)*(41)cos(C)$

$9^2- 40^2- 41^2 =-2(40)*(41)cos(C)$

$cos(C) = -\frac{9^2- 40^2- 41^2}{2(40)*(41)}$

$cos(C) =\frac{40}{41}\\\\cos(C)=0.976$

7 0

3 years ago

It takes jill 2 hours to run 14.5 miles. At this rate how far could she run in 3 hours?

grin007 [14]

Answer:

She can travel 21.75 miles in 3 hours.

Step-by-step explanation:

Firstly, you have to find out how many miles can Jill travel in 1 hour. So you divide it by 2 :

$2hr = 14.5miles$

$1hr \: = 14.5 \div 2 \\ 1hr = 7.25miles$

We have found out that she can travel 7.25 miles per hour. Next wr have to multiply it by 3 as the question says how far she run in 3 hours :

$1hr = 7.25miles$

$3hr = 7.25 \times 3 \\ 3hr = 21.75miles$

8 0

3 years ago

Solve by elimination <br> 4x+5y=15<br> 6x-4y=11

lyudmila [28]

X = 5/2 ,y = 1.I usually solve for x first then substitute the answer in one of the equations to find y.

8 0

4 years ago

A cube has a volume of 27 squared feet. What is the length of each side?

Step2247 [10]

Hello!

The formula for volume of a cube is $V= a^{3}$ ; you are given the volume, so plug it into the formula for $V$ .

$V= a^{3}$
$27= a^{3}$

Take the cube root of each side:

$27= a^{3}$
$\sqrt[3]{27} = a^{3}$
$3=a$

Answer:
The length of each side is 3 cubic feet.

7 0

4 years ago

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NEED THIS ANSWERED BEFORE 11!!!! WILL GIVE BRAINLIEST.

Nat2105 [25]

Answer:

whats the question????????

8 0

3 years ago

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