Solve the problem.In Smithville, there were 225 teachers in 1990 and 321 teachers in 2000. Find the percent of increase in the number of teachers in Smithville during this time period. Round to the nearest tenth of a percent.
A. 42.7%
B. 46.9%
C. 29.9%
D. 51.2%
Answer: A
Mathematics
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Rationalize the denominator. If any variables are present, assume that they represent nonnegative numbers, and assume that the denominator is not zero.
A. 
B. 
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D. 
Mathematics
Use the formulas for measuring sounds to find the missing value. 
The intensity I of a sound is given. Find the loudness L of the sound.I = 10-7 W/m2
A. L = 70 dB B. L = 190 dB C. L = 60 dB D. L = 50 dB
Mathematics
Add.-5 + (-2) + 19
A. 12 B. 26 C. 0 D. -26
Mathematics
Solve the equation by making a table of values. Use -3, -2, -1, 0, 1, 2, and 3 for the values of x in your table.7 - 5x = -3
A. 1 B. 2 C. -2 D. -3
Mathematics