Solve the problem.The gravitational attraction A between two masses varies inversely as the square of the distance between them. The force of attraction is 9 lb when the masses are 2 ft apart, what is the attraction when the masses are 6 ft apart?
A. 1 lb
B. 3 lb
C. 4 lb
D. 2 lb
Answer: A
Mathematics
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Multiply the polynomials using a special product formula. Express the answer as a single polynomial in standard form.(x + 10)(x - 10)
A. x2 - 20 B. x2 + 20x - 100 C. x2 - 100 D. x2 - 20x - 100
Mathematics
Rationalize the denominator. Assume that all variables represent positive real numbers. 
A. 
B. 
C. 
D. 
Mathematics
Find the circumference and area of a circle having the given diameter or radius. Use 3.14 for ?. Round your results to the nearest tenth.r = 2.4 mi
A. 15.1 mi; 15.1 mi2 B. 15.1 mi; 18.1 mi2 C. 7.5 mi; 30.1 mi2 D. 7.5 mi; 72.3 mi2
Mathematics
Write the expression with positive exponents only. Then simplify, if possible.(-4)-2
A. - 
B. 16
C. 
D. -16
Mathematics