A group of French students plan to visit the United States for two weeks. They are trying to pack appropriate clothing, but are not familiar with Fahrenheit. One student remembers this formula:
where F is the temperature in Fahrenheit and C is the temperature in Celsius. Solve the equation for C.
C =
Correct
The simple interest formula is , A = P + Prt, where
A = the full amount paid for the loan
P = the principle or the amount borrowed
r = the interest rate as a decimal
t = time in years
A car dealership wants to use the formula to find the rate needed for certain values of the other variables. Solve the formula for r.
r =