What is the perimeter of a 23cm semi-circle??

pl i need hel

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

Abook store is having a 30 perscent off sale. diary of the wimpy kid books are now 6.30 dollars each what was the original price of the books

Factor the following expression completely 6x^11-24x^7