Need help with this ASAP not really sure what I’m doing

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?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Which of the following circles have their centers on the x-axis? check all that apply.