My question is on the picture, if someone would answer it that would be great! Also id like to know HOW to answer it too! Thanks! :D

What number produces an irrational number when multiplied by -1.25

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?

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?