Solve the variation problem.According to Ohm's law, the electric current I, in amperes, in a circuit varies directly as the voltage V. When 15 volts are applied, the current is 2 amperes. What is the current when 8 volts are applied?
A. 1.07 amperes
B. 7.5 amperes
C. 25 amperes
D. 60 amperes
Answer: A
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Solve the problem. Round to the nearest hundredth, if necessary.A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 210 and a standard deviation of 50. If an applicant is randomly selected, find the percentage of applicants with a rating that is between 165 and 220.
A. 39.52% B. 57.93% C. 21.11% D. 18.41%
Solve the problem. Do not use a calculator.Find the maximum y-value on the graph of y = - 6x2 - 108x - 489
A. 9 B. 0 C. -3 D. 3
Solve the problem.Mardi received an inheritance of $60,000. She invested part at 12% and deposited the remainder in tax-free bonds at 10%. Her total annual income from the investments was $6600. Find the amount invested at 12%.
A. $53,400 B. $30,000 C. $29,000 D. $15,000
Solve and check.
= 
A. x = 13
B. x = - 2
C. x = - 
D. x = - 13