Write the sum using summation notation, assuming the suggested pattern continues. -9 - 4 + 1 + 6 + + 66

Click on the graphic until you find the right quotient. (36xa - 30xb) ÷ (-6x2)

Question: what is the value of x 4x-2= (-7) +5x. it would be greatly appreciated if someone could actually explain to me step by step

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).