Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 
Answer: A
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Solve the problem.Gloria collected 35 fantail and comet goldfish. There were 3 fewer fantails than comets. How many comets did Gloria have?
A. 32 comets B. 11 comets C. 19 comets D. 16 comets
Solve the problem.A software development company has offices in three cities: Chicago, Los Angeles, and New York. The Chicago office has 12 programmers, the Los Angeles office has 42 programmers, and the New York office has 84 programmers. Each office is to divide its programmers into project groups such that all groups are the same size no matter which office any particular group happens to be in. What is the largest size the project groups can be?
A. 3 programmers per project group B. 10 programmers per project group C. 6 programmers per project group D. 8 programmers per project group
Determine whether the polynomial is a sum of cubes, a difference of cubes, or neither.x3 + 729
A. Neither B. Difference of cubes C. Sum of cubes
Solve the problem.When an object is dropped to the ground from a height of h meters, the time it takes for the object to reach the ground is given by the equation t = 
, where t is measured in seconds. Solve the equation for h. Use the result to determine the height from which an object was dropped if it hits the ground after falling for 7 seconds.
A. h = 24.01t2; 1176.5 m B. h = 24.01t; 168.1 m C. h = 4.9t; 34.3 m D. h = 4.9t2; 240.1 m