Find the vertex of this parabola y=-5x^2-10x-13

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?

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?

What is the area of the shaded sector?