The cost to rent skis at a local sporting goods store is $15 plus $20 per day. Which equation models the relationship between the total cost to rent, c, and the length of the rental in days, d?
c = (15 +20)
c = 15d + 20
c = 200 + 15
O c = (15+ d)20

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

The width of a piece of rectangular land is 5m shorter rhan 1/3 of its length .find the width of the land if the length is 60m,150m.

Complete the statements about the two cones. the volumes of the cones are equal when . if a > b, then the cross-sectional area of cone a is the cross-sectional area of cone b at every level parallel to their respective bases.