Is this graph and function and why ? What is the domain of the relation ?

What is the range of the relation ?

Need answer ASAP

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 expression is equivalent to -5(3x - 6/7)

Which two undefined geometric terms always describe figures with no beginning or end?