Answer:

Step-by-step explanation:
The function is given.

To find : 
The input for the function f(x) is (a + 1).
Replace x with (a + 1).

Expand brackets.

Simplifying.

Answer:

Step-by-step explanation:
Area of a rectangle is simply length times width
{
} * x would be the area
That can be simplified to

Which can be further simplified to

Answer:
Density equals the mass of the object divided by its volume; D = m/v.
Step-by-step explanation:
Answer:
36
Step-by-step explanation:
15 divided by 5 would = 3
3 is the cost of 1 cupcake
3 x 12 is 36
25•15=365-50=315 so that is the answer