how can you use plug-in for #13 on page 607?

To get this one by plugging in, pick values for all the variables on the right side of the equals sign: *t*, *v*, and *k*. For example, say *t* = 2, *v* = 3, and *k* = 5. Use your calculator to see what that gives you for *h*:

Now plug –53 in for *h*, 2 in for *t*, and 5 in for *k* in each answer choice. The one that gives you 3 (our original value for *v*) is the right answer.

Choice D does the trick:

Note that I’m not saying you need to do the question this way, just that it CAN be done this way. On a more complicated algebraic manipulation question, you might be happy to have a method like this in your back pocket.

Because I know someone will ask, here’s the algebra: