Answer:
48
Step-by-step explanation:
multiply length times width divide by 2
the first one is graph two
The second one is graph 3 because he didn't stop he slowed down.
Check whether it is possible to have a triangle with the given side lengths for example 7,9,13 then add any two sides and see if it is greater than the other side. Example the sum of 7 and 9 is 16 and 16 is greater than 13
ANSWER
9.6
EXPLANATION
The given trigonometric equation is:
![\cos(21 \degree) = \frac{9}{y}](https://tex.z-dn.net/?f=%20%5Ccos%2821%20%5Cdegree%29%20%20%3D%20%20%5Cfrac%7B9%7D%7By%7D%20)
We want to find y, so we multiply both sides by y to get,
![y\cos(21 \degree) = \frac{9}{y} \times y](https://tex.z-dn.net/?f=y%5Ccos%2821%20%5Cdegree%29%20%20%3D%20%20%5Cfrac%7B9%7D%7By%7D%20%20%5Ctimes%20y)
Cancel out the common factors,
.
![y\cos(21 \degree) = 9](https://tex.z-dn.net/?f=y%5Ccos%2821%20%5Cdegree%29%20%20%3D%209)
. Divide both sides by cos(21°)
![y= \frac{9}{\cos(21 \degree)}](https://tex.z-dn.net/?f=y%3D%20%20%5Cfrac%7B9%7D%7B%5Ccos%2821%20%5Cdegree%29%7D%20)
![y = 9.64](https://tex.z-dn.net/?f=y%20%3D%209.64)
To the nearest tenth, y=9.6