How do you find the vertex on a porabola

In trapezoid bath, ah=19.7 and et=16.1. identify be.

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?

What is the order of these fractions from least to greatest 2/3 7/10 5/8 65/100