Solve each applied problem.(Modeling) Holding Time of Athletes A group of ten athletes wer...

Solve each applied problem.

(Modeling) Holding Time of Athletes A group of ten athletes were tested for isometric endurance by measuring the length of time they could resist a load pulling on their legs while seated. The approximate amount of time (called the holding time) that they could resist the load was given by the formula

where w is the weight of the load in pounds and the holding time t is measured in seconds. (Source: Townend, M. Stewart, Mathematics in Sport, Chichester, Ellis Horwood Limited, 1984.)

(a) Determine the holding time for a load of 25 lb.

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(b) When the weight of the load is doubled, by what factor is the holding time changed?