Use least common multiple or greatest common divisor to solve the problem.Three taxi cabs make a complete trip from downtown to the airport and back in 15, 33 and 55 minutes, respectively. If all three cabs leave at the same time, what is the shortest time that must pass before they are all together again?
A. 165 minutes
B. 1815 minutes
C. 495 minutes
D. 103 minutes
Answer: A
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Solve the equation.
- 
= - 
A. 8 B. -4 C. -8 D. No solutions
Use the given information to write an equation. Let x represent the number described in the exercise. Then solve the equation and find the number.When 5 times a number is subtracted from 7 times the number, the result is 16. Find the number.
A. 5x(7 - x) = 16; -8 B. 7x - 5x = 16; 8 C. 5(x - 7) = 16x; 0.3 D. 5x + 8x = 16; 2
Perform the indicated operations and simplify the result. Leave the answer in factored form.
? 
A. - 
B. - 
C. 
D. - 
Solve the problem.The surface area of a sphere with radius r is 4? r2. Write a polynomial that gives the surface area of a sphere with radius 
A. 4?(r + 4) B. 4?(r2 + 4) C. 4?(4r2 + 4r + 4) D. 4?(r2 + 4r + 4)