Help pls !! thank you so much .

a = 12

Step-by-step explanation:

Pythagorean Theorem: a^2 + b^2 = c^2

a^2 + 9^2 = 15^2      >> solve the exponent

a^2 + 81 = 225         >> subtract both sides by 81

a^2 = 144                  >> square root

a = 12

the answer is 489

step-by-step explanation:

step-by-step explanation:

y = | -2(-2) |     →     y = | 4 |     →     y = 4       ⇒   (-2, 4)

y = | -2(-1) |     →     y = | 2 |     →       y =   2       ⇒   (-1, 2)    

y = | -2(0) |     →     y = | 0 |     →       y = 0         ⇒   (0, 0)

y = | -2(1) |   c →     y = | -2 |     →     y =   2         ⇒   (1, 2)    

y = | -2(2) |     →     y = | - 4 |     →     y =   4         ⇒   (2, 4)