Claire and two friends went out for cake and coffee. The total cost of the
coffee was $8. If each person paid $9, what was the total cost of the cake?

$19

Step-by-step explanation:

If each person paid $9 , amount spent = $9 x 3

= $27 since they were three that went for the cake and coffee .

Given the total cost of the coffee was $8,

Cost of cake = $27 - $8

= $19

The total cost of the cake was $19

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13