Using Formulas to Solve Word Problems

Question

Solve the formula for the specified variable.

I=Prt

r=   

Use pi for ππ. Put a space after ππ and before the variables.

Answer 1

Need to use order of operations rules to isolate the r from the rest of the formula.

I = Prt (the formula for simple interest, where is the principal invested, r is the interest rate and t is the no. of interest periods).

The opposite of multiplication is division, so you can divide both sides by Pt.

I/Pt = Prt/Pt which leaves r = I/Pt