Samantha sold her collection of model cars for $600. She had purchased them for $520 a year earlier. What is her gain in dollars? What is her return on investment? (Round to the nearest whole percent.)

Explain how the quotient of powers was used to simplify this expression.

If twice a number is at least three less than four times the number, which of the following are true? let n represent the number.

The thickness of photoresist applied to wafers in semiconductor manufacturing at a particular location on the wafer is uniformly distributed between 0.2070 and 0.2171 micrometers.(a) determine the proportion of wafers that exceeds 0.2125 micrometers of photoresist thickness. (round your answer to 3 decimal places.)enter your answer in accordance to the item a) of the question statement(b) determine the mean of x. (round your answer to 4 decimal places.)enter your answer in accordance to the item b) of the question statement micrometers(c) determine the variance of x. (round your answer to 8 decimal places.)enter your answer in accordance to the item c) of the question statement micrometers2