Find the side length x of the shelf

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

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?

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?