Write the number in words.9,070,838
A. nine million, seven thousand, eight hundred thirty-eight
B. nine million, seven hundred thousand, eight hundred thirty-eight
C. nine million, seventy thousand, eight hundred thirty-eight
D. ninety-seven hundred thousand, eight hundred thirty-eight
Answer: C
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Solve the problem.A spherical tank of water has a radius of 
, with the center of the tank 
above the ground. How much work will it take to fill the tank by pumping water up from ground level? Assume the water weighs 
Give your answer to the nearest ft ? lb.
A. 9,139,520 ft ? lb B. 35,890,811 ft ? lb C. 28,712,649 ft ? lb D. 14,356,324 ft ? lb
Solve the problem.In the formula A(t) = A0ekt, A is the amount of radioactive material remaining from an initial amount A0 at a given time t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.125% annually. Determine the half-life of this isotope, to the nearest year.
A. 241 years B. 555 years C. 6 years D. 400 years
Solve the quadratic inequality by graphing an appropriate quadratic function.x2 + 10 ? 0
A. No solution B. (-?, ?) C. (-?, 10) D. (10, ?)
Find the unit vector having the same direction as v.v = 12i + 5j
A. u = - 
i - 
j
B. u = 
i + 
j
C. u = 
i + 
j
D. u = 156i + 65j