What is -15÷3 please help me with this

When ∆rst is translated 4 units down, what are the apparent coordinates of t’? give 15 points

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?

Hi my sisters and brothers can tell me the answer because i don’t understand the question