The base of a solid right pyramid is a square with an edge length of n units. the height of the pyramid is n − 1 units. which expression represents the volume of the pyramid?

For this case we have that by definition, the volume of a pyramid is given by:

Where:

It is the area of the base

h: It is the height

According to the data we have that the base of the pyramid is square, so its area is:

Substituting we have:

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n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9