Simplify.13.8 ? 15.9 + 12.1 ? 6.7
A. 1338.2
B. 1551.2
C. 2588.9
D. 300.49
Answer: D
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Use scientific notation to solve the problem.A computer can do one calculation in 1.4 x 10-7seconds. How long would it take the computer to do a trillion (1012) calculations?
A. 1.4 x 1012 sec B. 1.4 x 106 sec C. 1.4 x 105 sec D. 1.4 x 10-7 sec
Write the whole number in expanded form.58,307,001
A. 50,000,000 + 8,000,000 + 300,000 + 7000 + 1 B. 50,000,000 + 8,000,000 + 300,000 + 700 + 1 C. 50,000,000 + 800,000 + 30,000 + 7000 + 1 D. 58,000,000 + 307,000 + 1
Solve the problem.162 students attended an assembly at Piper School. The student enrollment at the school is 648. What percentage of the students attended the assembly?
A. 15% B. 30% C. 5% D. 25%
Factor the difference of two squares.x2 - 9
A. (x - 3)(x - 3) B. (x2 + 3)(x2 - 3) C. (x + 3)(x - 3) D. (x + 9)(x - 9)