Home->ACT Math

At the end of each month, a credit card company uses the formula D = B (1 + r) + 10m² to calculate debt owed, where D is the cardholder's total debt; B is the amount charged to the card; r is the rate of interest; and m is the number of payments the cardholder has previously missed. If Daniel has charged $2,155 to his credit card with a 13% interest rate and has missed 2 payments, which value is closest to Daniel's total credit card debt?

(A)$2,195

(B) $2,435

(C) $2,455

(D) $2,475

(E) $2,495

In the following figure, the circle centered at nhas a radius of 4. What is the area of the shaded region?

(A) 3π(B) 6π(C) 9π(D) 12π(E) 16π

Correct Answer: D

The kinetic energy, KE, of an object travelling at v velocity can be modeled by the equation KE = mv2, where m is the mass of the object. If an object is moving at a velocity of 9, and it has a kinetic energy of 120, about how great is the object's mass?

(A) Between 0 and 1(B) Between 1 and 2(C) Between 2 and 3(D) 6(E) 13

Correct Answer: C

So far, a student has earned the following scores on four 100-point tests this grading period:65,73,81, and 82. What score must the student earn on the fifth and last 100-point test of the grading period to earn an average test grade of 80 for the 5 tests?

(A) 75 (B) 76 (C) 78 (D) 99 (E) The student cannot earn an average of 80.

Correct Answer: D