Solve the problem.A contractor finds that it takes Sam Tockett 10 hours to construct a wall of a certain size. It takes Jim Lowell 6 hours to construct the same wall. How long would it take if they worked together?
A. 3
hr
B. 
hr
C. 1 hr
D. 16 hr
Answer: A
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Fill in the blank with the appropriate answer.A(n) ________________ angle is an angle with a measure greater than 90° and less than 180°.
Fill in the blank(s) with the appropriate word(s).
Divide.
÷ 
A. 
B. 
C. 
D. 
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. An insurance company is willing to insure the concert for $150,000 against rain for a premium of $30,000. If he buys this policy, what are his expected earnings from the concert?
A. $180,000 B. $300,000 C. $270,000 D. $239,400
Express the statement as an equation involving the indicated variables.The volume V of a sphere is 
times ? times the cube of the radius r.
A. V = 
?r2
B. V = 
?r
C. V = 
?r3
D. V = 
? 