What is the measure of angle A?

  38 degrees

Step-by-step explanation:

The angle can be found using the Law of Cosines:

  a² = b² +c² -2bc·cos(A)

  cos(A) = (b² +c² -a²)/(2bc) = (3² +7² -5²)/(2·3·7) = 33/42

  A = arccos(33/42) ≈ 38.213°

The measure of angle A is about 38°.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

b.-4 units

all you   do is count how many times you move