ACT - Math - 查题吧

单选题

A flight instructor charges $50 per lesson, plus an additional fee for the use of his plane. The charge forthe use of the plane varies directly with the square root of the time the plane is used. If a lesson plus 16 minutes of plane usage costs $90, what is the total amount charged for a lesson having 36 minutes of plane usage？

A. $185
B. $150
C. $135
D. $110
E. $60

单选题

What is the area of the stained-glass panel, to the nearest 0.1 square foot？

A. 3.1
B. 4.0
C. 6.2
D. 8.0
E. 12.6

单选题

If 9(x - 9) = -11, then x = ？

A. -92/9
B. -20/9
C. -11/9
D. -2/9
E. 70/9

单选题

(a + 2b + 3c) - (4a + 6b -5c) is equivalent to:

A. -4a - 8b - 2c
B. -4a - 4b + 8c
C. -3a + 8b - 2c
D. -3a - 4b - 2c
E. -3a - 4b + 8c

单选题

Joelle earns her regular pay of $7.50 per hour for up to 40 hours of work in a week. For each hour over 40 hours of work in a week, Joelle is paid 1 times her regular pay. How much does Joelle earn for a week in which she works 42 hours？

A. $126.00
B. $315.00
C. $322.50
D. $378.00
E. $472.50

单选题

Meg pounded a stake into the ground. When she attached a leash to both the stake and her dog’s collar,the dog could reach 9feet from the stake in any direc-tion. Using 3.14 for π, what is the approximate area ofthe lawn, in square feet, the dog could reach from thestake？

A. 28
B. 57
C. 113
D. 254
E. 283

单选题

What is the least common denominator for adding the fractions 4/15,1/12, and 3/8？

A. 40
B. 120
C. 180
D. 480
E. 1440

单选题

To keep up with rising expenses, a motel managerneeds to raise the $40.00 room rate by 22%. What willbe the new rate？

A. $40.22
B. $42.20
C. $48.00
D. $48.80
E. $62.00

单选题

Which of the following integers is the closest to the value for the unit length of one leg

A. 8
B. 9
C. 10
D. 11
E. 12

单选题

A certain cube contains 125 cubic inches.What is the surface area, in square inches,of each square face of the cube？

A. 5
B. 10
C. 15
D. 20
E. 25

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