82.) a varies directly as b and inversely as the square of c, and a=10, when b=8 and c=2. Find a when b=20 and c=5.

83.) During a canoe trip, Roberto paddled twice as many hours as Edward, and Jim paddled for one hour. If the three of them paddled less than a total of ten hours, what is the number of hours Roberto could have paddled?

Guest Aug 17, 2020

#1**0 **

a ~ b/ c^{2} k k is proprtionality constant calculate k by subbing in the initial values

10 = 8/2^2 k

k =5

a = 5b/c^{2}

a = 5(20)/5^{2} = .........

ElectricPavlov Aug 17, 2020