A hiker climbed up from the bottom of a mountain. His elevation increased at a rate of 40 feet each hour.
Which equation models the change in his elevation at 3 hours?
A. (-3)(-40) = -120
B. 3(-40) = 120
C. 3.40 = 120
D. 3(-40) = -120

I’m still confused on how to work the percentages

Marion has a bicycle that she is planning to take for a ride. the rim of the rear wheel lies 41 cm from the center of the wheel. the tire itself has a thickness of 3 cm. in order for marion to ride her bicycle 96,712 cm approximately how many rotations will the rear wheel make?

Asail is in the form of a right triangle that is 3 times as high as it is wide. the sail is made from 6 square meters of material. what is the height?