A jeweler has three small solid spheres made of gold, of radius 1 mm, 2 mm, and 3 mm. He decides to melt these down and make just one sphere out of them. What will the radius of this larger sphere be? Round the answer to one decimal place.
What will be an ideal response?
3.3 mm
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How many seven-digit phone numbers are available in area code 837 if no phone number can begin with 0 and 1?
A. 1,000,000 B. 8,000,000 C. 4,500,000
Find the gradient ?f.f(x, y) = 
A. (x2 + y2)-2[y2(y2 - x2)i + 2x2yj] B. (x2 + y2)2[y2(y2 - x2)i + 2x2yj] C. (x2 + y2)-2[2x2yi + y2(y2 - x2)j] D. (x2 + y2) [2x2yi + y2(y2 - x2)j]
Solve the problem.A survey of a group of 115 tourists was taken in St. Louis. The survey showed the following:66 of the tourists plan to visit Gateway Arch;50 plan to visit the zoo;11 plan to visit the Art Museum and the zoo, but not the gateway Arch;14 plan to visit the Art Museum and the Gateway Arch, but not the zoo;19 plan to visit the Gateway Arch and the zoo, but not the Art Museum;8 plan to visit the Art Museum, the zoo, and the Gateway Arch;14 plan to visit none of the three places.How many plan to visit the Art Museum only?
A. 101 B. 12 C. 38 D. 50
Add.
A. 1225 B. 1323 C. 9733 D. 1326