A formula is given, along with values for all but one of the variables in the formula. Find the value of the variable that is not given. Round to the nearest hundredth when necessary.
-I = prt; I = 16.8, p = 210, r = 0.01
A)t = 35.28
B)t = 0.8
C)t = 8
D)t = 0.35

Question

Quizplus · Accepted Answer

We are given the formula I = prt and the values I = 16.8, p = 210, and r = 0.01. We need to find the value of t.

Plugging in the given values, we get:

16.8 = 210 * 0.01 * t

Dividing both sides by (210 * 0.01), we get:

t = 16.8 / (210 * 0.01)
t = 8

Therefore, the value of t is 8, and the best choice is C. We can solve for t by rearranging the formula: 
I = prt 
16.8 = 210 * 0.01 * t 
16.8 = 2.1t 
t = 16.8/2.1 
t ≈ 8 
Therefore, the value of t is 8.

A Formula Is Given, Along with Values for All but One