John scored 20 points on his first 40 points on his second test . what % change is that

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

What is 1/2 x (6 x 4)+3 + 2 show your work

Yoku is putting on sunscreen. he uses 2\text{ ml}2 ml to cover 50\text{ cm}^250 cm 2 of his skin. he wants to know how many milliliters of sunscreen (c)(c) he needs to cover 325\text{ cm}^2325 cm 2 of his skin. how many milliliters of sunscreen does yoku need to cover 325 \text{ cm}^2325 cm 2 of his skin?