F(x) = –x2- 4x – 19
Find f(-9)

f(-9) = -64

Step-by-step explanation:

f(x) = -x^2 - 4x - 19

f(-9) = -(-9)^2 - 4(-9) - 19

f(-9) = -81 + 36 - 19

f(-9) = -64

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²