Solve the system by the substitution method or the addition method. Identify a system with no solution or infinitely many solutions, using set notation to express the solution set.
A. {(1, 1)}
B. {(x, y) 
C. no solution or ?
D. {(-1.5, -1)}
Answer: B
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Which of the following best exemplifies the measurement model of division for one-half divided by one-third?
a. The total area of a rectangular piece of carpet is one-half of a square meter. Its length is one-third of a square meter. What is its width? b. One-third of the total amount of time needed to paint a fence is one-half hour. What is the total amount of time needed to paint the fence? c. You have one-half of a pizza left and want to share it with three friends. How much pizza should each friend receive? d. You have one-half pound of hamburger in the freezer, and wish to make hamburgers that are one-third pound each. How many hamburgers can you make?
Solve for x.2-3x + 5 = 
A. {3}
B. {8}
C. {-3}
D. 
Find the cross product a x b.
a=(5,5,3), b(-5,4,-4)
Use exponential notation to write the repeated multiplication.7 ? 7 ? 7
A. 37 B. 3 ? 7 C. 71 D. 73