Can someone help me with this math

- 1 and 63

Step-by-step explanation:

(2)

Given

- 6x + 9y - z ← substitute x = - 4, y = - 2 , z = 7 into the expression

= - 6(- 4) + 9(- 2) - 7

= 24 - 18 - 7

= - 1

(3)

Given

- 9(x + y)  ← substitute x = 4 and y = - 11 into the expression

= - 9(4 + (- 11))

= - 9(4 - 11)

= - 9(- 7)

= 63

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50