Fernando has been saving money to buy an e-book reader. A store has just marked down the price of its readers by 40%. Each reader comes in with a mail-in rebate for $25. The original price of the e-book reader was $150. The total amount off includes the markdown and the rebate. What is the total amount off? Show your work.

The answer is $75.

first, 150-25=125
then you set up your rates
.40
—— = —— cross multiply 125 x .40= 50
125 100

50 .40
—- = ——-
125 100

then subtract 125-50 because of the markdown. then you get $75.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

It would take her 20 minutes.