Multiply.
? 
A. - 
B. - 
C. 
D. - 
Answer: B
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Solve the problem.Use each of the numbers 7, 8, 9, 10, and 11 once and only once to fill in the circles so that the sum of the numbers in the three horizontal circles equals the sum of the numbers in the three vertical circles. 
Which numbers can be placed in the middle of the horizontal row?
A. 7, 8, and 9 B. 9, 10, and 11 C. 8, 9, and 10 D. 7, 9, and 11
Find the probability of the compound event.An urn contains balls numbered 1 through 15. A ball is chosen, returned to the urn, and a second ball is chosen. What is the probability that the first and second balls will be a(n) 6?
A. 
B. 
C. 
D. 
Use the associative property of addition to write an equivalent algebraic expression.(np + f) + m
A. np + (f + m) B. m + (np + f) C. n + (pf + m) D. n(p + f) + m
Solve the problem.Jeff takes 5 hours longer to build a fence than it takes Bill. When they work together, it takes them 6 hours. How long would it take Bill to do the job alone?
A. 11 hours B. 10 hours C. 12 hours D. 9 hours