Hello!
To find cosine, use the formula cos = adjacent / hypotenuse.
According to angle B, adjacent of angle B is side A, and the hypotenuse is side c because the hypotenuse is always opposite the right angle.
Therefore, the cosine of angle B is a/c.
Answer:

Step-by-step explanation:
The lines surrounding 10 are called positive brackets, meaning the no matter what number is in those brackets, it will always come out of positive.
There is nothing to do with just 10 because we don't need to change anything.
|10| simplified is 10
Answer:
Huh?? I have no idea what you said.
Step-by-step explanation:
Answer:
Slope intercept form; -4y = -3x + 9
Y-intercept; 9
The vertex is (-1,2) thats all i know