A baker iced 40 cupcakes in 70 minutes, and iced 28 cupcakes in 49 minutes. What is the constant of proportionality? Express your answer in decimal form.

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?

Bring the fraction a/a-4 to a denominator of 16-a^2