Solve the problem.A sprinkler rotates back and forth through an angle ?, as shown in the figure. At a distance of 6 feet from the sprinkler, the rays that form the sides of angle ? are 10 feet apart. Find ?.
A. 30°
B. 59°
C. 40°
D. 80°
Answer: D
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Provide an appropriate response.Subtract and reduce when necessary: 
- 5
A. 1
B. 
C. 
D. 
The radioactive substance neptunium-139 decays to 73.64% of its original amount after 24 hours. How long (to the nearest hour) would it take for 39% of the original neptunium to be present? ?
A. 83 hr B. 77 hr C. 39 hr D. 74 hr E. 68 hr
Solve the problem.Let B = the set of people who play tennis players and C = the set of people who play soccer.(i) Describe the set B ? C.(ii) Describe the set B ? C.
A. (i) people who play neither tennis nor soccer (ii) people who play both tennis and soccer B. (i) people who play both tennis and soccer (ii) people who play either tennis or soccer C. (i) people who play either tennis or soccer (ii) people who play both tennis and soccer D. (i) people who play either tennis or soccer (ii) people who play neither tennis nor soccer
Solve the equation for ? if 
. Give your answer in degrees.
?
What will be an ideal response?