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Chapter 2: Q. 2.120 (page 269)

Solve the formula d = rt for r : ⓐ when d = 780 andt = 12 ⓑ in general

Short Answer

Expert verified

a.Theformulahavesolutionr=60b.Theformular=dtissolvedforr

Step by step solution

01

Step 1.  Given information

The given formula is d = rt .

We have to solve the given eqauation when ⓐ d =720 and t = 12 ⓑ in general.

02

Step 2. Part (a). Explanation

Solve:a.Whend=720andt=12Givenformulad=rt⇒720=r×(12)(Substitute)⇒72012=r×(12)12(Dividebothsidesby12)⇒60=r(Simplify)Theformulahavesolutionr=60

03

Step 2. Part (b). 

b.IngeneralGivenformulad=rt⇒dt=rtt(Dividebothsidesbyt)⇒dt=r(Simplify)Theformuladt=rissolvedforr

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