Translate to a proportion and solve. When necessary, round to the nearest hundredth.What is 81% of 283?
A. 22.92
B. 229.23
C. 2292.3
D. 22,923
Answer: B
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Perform the exponentiation.(-4)3
A. -64 B. -12 C. 12 D. 64
Solve.The mass of an electron is approximately 9.11 × 10-28 grams. Find the mass of 539,000,000 electrons.
A. 4.91029 × 10-17 grams B. 4.91029 × 10-20 grams C. 4.91029 × 10-18 grams D. 4.91029 × 10-19 grams
Decide whether the given number is a solution of the equation.
+ 3 = -2; -36
A. solution B. not a solution
Solve the problem.The formula 
can be used to estimate the maximum safe velocity v, in miles per hour, at which a car can travel along a curved road with a radius of curvature r, in feet. To the nearest whole number, find the radius of curvature if the maximum safe velocity is 25 miles per hour.
A. 100 ft B. 625 ft C. 1563 ft D. 250 ft