Solve.Mary and her brother John collect foreign coins. Mary has three times the number of coins that John has. Together they have 180 foreign coins. Find how many coins Mary has.
A. 135 coins
B. 126 coins
C. 45 coins
D. 27 coins
Answer: A
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Solve.The volume of a given mass of gas varies directly as the temperature and inversely as the pressure. If the volume is 
when the temperature is 
and the pressure is 
per square inch, then what is the volume when the temperature is 
and the pressure is 
style="vertical-align: -4.0px;" /> pounds per square inch? A. 482 cubic inches B. 462 cubic inches C. 442 cubic inches D. 33 cubic inches
Determine the quadratic function whose graph is given.
A. f(x) = -x2 - 4x - 5 B. f(x) = x2 - 4x + 5 C. f(x) = x2 - 4x - 5 D. f(x) = x2 + 4x - 5
Solve the problem.The amount of gas that a helicopter uses is directly proportional to the number of hours spent flying. The helicopter flies for 2 hours and uses 16 gallons of fuel. Find the number of gallons of fuel that the helicopter uses to fly for 5 hours.
A. 10 gal B. 48 gal C. 45 gal D. 40 gal
Use the Gauss-Jordan method to find A-1, if it exists.A = 
A. 
B. 
C. 
D. Does not exist