The perimeter of an equilateral triangle measure 48 inches. the midpoints of the side of the triangle are joined to form another equilateral triangle with sides that are half the length of the outer triangle. the process is continued until three smaller triangles are created within the first triangle. use a geometric series to model the perimeters of the four triangles.
the sum of the perimeters of all four triangles is ___ inches.

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

true

step-by-step explanation:

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you need to add a picture