Write the phrase as a variable expression. Use x to represent "a number."4 less than 9 times a number
A. 4x - 9
B. 9x - 4
C. 4 - 9x
D. 9 - 4x
Answer: B
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Calculate.
× 117.4 - 
× 27.51
A. 47.696 B. 49.096 C. 37.296 D. 1603.833
Solve the problem.The decay of 243 mg of an isotope is given by 
where t is time in years since the initial amount of 243 mg was present. Find the amount (to the nearest milligram) left after 72 years.
A. 89 B. 45 C. 87 D. 240
Some bank robbers leave town, speeding at 48 mph. 25 minutes later, the police give chase, traveling at 58 mph. How long will it take the police to overtake the robbers? (Please calculate the time in hours.) ?
A. 1.5 hour(s) B. 2 hour(s) C. 3 hours D. 5 hours E. 2.5 hours
Find the value of c for which the expression is a perfect-square trinomial. Then factor the perfect-square trinomial.x2 + 12x + c
A. 144; (x + 12)2 B. 36; (x + 6)2 C. 12; (x + 144)2 D. 6; (x + 36)2