Solve the problem.An airplane took 5 hr to fly 700 mi against a head wind. The return trip with the same wind took 1 hr. Find the speed of the plane in still air.
A. 280 mph
B. 140 mph
C. 700 mph
D. 420 mph
Answer: D
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Express the area of the region bounded by the given line(s) and/or curve(s) as an iterated double integral.The curve 
and the lines 
and 
A. 
B. 
C. 
D. 
Julio purchased 400 shares of a certain stock for $24,750 (including commissions). He sold the shares 6 year(s) later and received $32,800 after deducting commissions. Find the effective annual rate of return on his investment over the 6-year period. Round your answer to the nearest hundredth. ? __________%
Fill in the blank(s) with the appropriate word(s).
Add or subtract, if possible. Assume that all variables represent non-negative values. Simplify your answer. 
+ 
A. -5
B. 13
C. 39
D. 13
Factor out the negative of the GCF.-18s6t3 - 6s4t4
A. -6s2t(3s + t) B. -s4t3(18s + 6t) C. -6s6t4(3s2 + t) D. -6s4t3(3s2 + t)