Solve the problem. Round answer to the nearest tenth, if appropriate.The area of a square is 81 cm2. If the same amount is added to one dimension and removed from the other, the resulting rectangle has an area 9 cm2 less than the area of the square. How much is added and subtracted?
A. 12 cm
B. 4 cm
C. 3 cm
D. 9 cm
Answer: C
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Add or subtract.2
+ 2
A. 5
B. 4
C. 4
D. 4
Solve the problem.The decibel level D of a sound is related to its intensity I by 
. If I0 is 10-12, then what is the intensity of a noise measured at 93 decibels? Express your answer in scientific notation, rounding to three significant digits, if necessary.
A. 1.09 × 1016 watt/m2 B. 2 × 10-3 watt/m2 C. 2 × 10-2 watt/m2 D. 9.3 × 10-10 watt/m2
Solve the problem.The number of enrollees in health maintenance organizations (HMOs) in Illinois in a recent year was 2,148,075. This was a 40.5% increase over the previous year. What was the former number of enrollees?
A. 1,528,879 enrollees B. 611,552 enrollees C. 152,888 enrollees D. 3058 enrollees
Simplify the expression algebraically.
What will be an ideal response?