Add or subtract, if possible. Assume that all variables represent non-negative values. Simplify your answer. 
+ 
A. -5
B. 13
C. 39
D. 13
Answer: D
Mathematics
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Solve.A hot air balloon has a volume of 110,000 cu ft. If it is being filled at a rate of 2070 cubic yards per hour, how long will it take to fill the balloon? Round to the nearest hour.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Find the probability.One digit from the number 7,868,558 is written on each of seven cards. What is the probability of drawing a card that shows 5?
A. 1
B. 
C. 
D. 
Mathematics
Divide. Simplify, if necessary.6 ÷ 
A. 
B. 
C. 9
D. 
Mathematics
Rewrite using exponential notation. Assume that even roots are of nonnegative quantities and that all denominators are nonzero.
A. 
B. 
C. 
D. 
Mathematics