Find the value of x if DE is a midsegment

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?

How many verticies does a triangular prims have