Please help quickly!
The principal P0 is invested in an account that pays an annual interest rate r (written as a decimal), compounded n times per year.

The formula for the amount of money in the account at the end of the first period is given by the formula:
P=P˅0(1 + r/n)^n
Explain why the amount of money in the account at the end of the first year is given by the formula with n as the exponent:
P=P˅0(1 + r/n)^n

Ps. ˅ is a subscript arrow

In the rectangle below ac=30 units what is de

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The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.