Solve the problem. Express the answer in scientific notation to two decimals unless requested otherwise.A light-year is the distance that light travels in one year. Find the number of miles in a light-year if light travels 1.86 × 105 miles/second.
A. 5.87 × 105 miles
B. 5.87 × 107 miles
C. 5.87 × 1012 miles
D. 5.87 × 1014 miles
Answer: C
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Solve the problem.Suppose the amount of a radioactive element remaining in a sample of 100 milligrams after x years can be described by 
. How much is remaining after 186 years? Round the answer to the nearest hundredth of a milligram.
A. 0.03 mg B. 3676.99 mg C. 360.47 mg D. 2.72 mg
Find the missing value and write a conclusion.140% of 4020 is what number?
A. 140% of 4020 is 562,800. B. 140% of 4020 is 5628. C. 140% of 4020 is 563. D. 140% of 4020 is 56,280.
Solve using elimination.
A. x = 4, y = 3; x = -4, y = 3 ; x = 4, y = -3; x = -4, y = -3 or (4, 3), (-4, 3), (4, -3), (-4, -3) B. x = 4, y = 3; x = 3, y = 4; x = -4, y = -3; x = -3, y = -4 or (4, 3), (3, 4), (-4, -3), (-3, -4) C. x = -4, y = -3; x = -3, y = -4 or (-4, -3), (-3, -4) D. x = 4, y = -3; x = 4, y = 3 or (4, -3), (4, 3)
Find the inverse of the matrix, if it exists.
What will be an ideal response?