Solve and graph the solution set on a number line.|7x + 3| + 7 < 15
A. ?
B. 
C. 
D. 
Answer: B
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Solve the variation problem.The amount of paint needed to cover the walls of a room varies jointly as the perimeter of the room and the height of the wall. If a room with a perimeter of 40 feet and 
walls requires 
of paint, find the amount of paint needed to cover the walls of a room with a perimeter of 75 feet and 10-foot walls.
A. 750 quarts B. 7.5 quarts C. 75 quarts D. 15 quarts
Solve the problem.The level of a sound in decibels (db) is determined by the formula 
where I is the intensity of the sound in watts per square meter. What is the intensity of a noise measured at 53 db? Express the answer in scientific notation, rounded to two decimal places.
A. 2.00 × 10-7 watt/m2 B. 2.00 × 1014 watt/m2 C. 5.30 × 10-10 watt/m2 D. 2.00 × 10-6 watt/m2
Solve the system by graphing.
A. (1, 0) B. (0, 0) C. (0, 1) D. (1, 1)
Solve the problem.Robert receives a commission of $93 on sales of $3100. What is his commission rate?
A. 2% B. 6% C. 3% D. 4%