A) f(-1)= -4
B) f(-1)= 3
C) f(-1)= 1/4
D)f(-1) = 1/3

c  f(-1) = 1/4

Step-by-step explanation:

f(x) = x-1

      x^2 -9

Let x=-1

f(-1) = -1-1

         (-1)^2 -9

f(-1) = -2

         1 -9

     =-2/-8   = 1/4

b

step-by-step explanation:

the total is 23.97. 0.25% is off so you have to subtracting 25% from 100% and you will get 75% if you convert it to decimal you will get 0.75. you have to find the original because the formula is % times original = total.so you have the total and the % so you just have to plug it in.

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w