A formula is given along with the values of all but one of the variables in the formula. Find the value of the variable not given. Round to the nearest hundredth where necessary.P = 2L + 2W; P = 20, W = 4
A. L = 8
B. L = 16
C. L = 10
D. L = 6
Answer: D
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Determine what m and b represent.The cost, in dollars, of cellular phone service with Econo-phone is given by 
where x is the number of minutes used in one month.
A. 0.46 signifies the hourly phone rent, and 24.40 signifies the cost of the hardware. B. 24.40 signifies the total phone bill, and 0.46 signifies the number of minutes used. C. 0.46 signifies the cost per minute, and 24.40 signifies the monthly service charge. D. 24.40 signifies the cost per minute, and 0.46 signifies the monthly service charge.
Solve the problem.A person's emotional quotient (EQ) is found by multiplying emotional age by 100 and dividing by chronological age. Using this information, if a 13 yr old person has an EQ of 97 what is that person's emotional age?
A. 12.61 years old B. 22 years old C. 13.4 years old D. 13 years old
Simplify.
? 
A. -9 B. 12 C. -10 D. -5
Solve the problem.It costs $35 per hour plus a flat fee of $28 for a plumber to make a house call. Find the number of hours a plumber worked if the total cost was $343.
A. 4 B. 20 C. 9 D. 15