What is the surface area of the sphere? a. 242.68 mi2 b. 314.16 mi2 c. 364.05 mi2 d. 125.64 mi2

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6