Aline is the locus of points that:

a. are the same distance from one point

b. are the same distance from a directrix and a focus

c. have the same sum of distances from two points

d. are the same distance from two points

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?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.