Simplify this expression: 13 + (–12) – (–5) = ?
a. 6
b. –6
c. 30
d. –30

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?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?