A family lives in a large tower apartment building, 10 floors high. Every day their son takes the elevator from the family’s apartment on the
10th floor to the ground floor and goes to school.
When he returns in the afternoon, he uses the elevator to get to the fifth floor,
and then uses the stairs for the remaining five floors. Why?

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

answer:   expression= p+p*d%

price reduction + sale price = $625

sale price: $p+$p*d%

where d% is the percentage of discount

step-by-step explanation:

original price = p

price went down by $150 price reduction $p*d%

sale price= $ 475

therefore the price before sale is: $625

and the expression that shows the price before sale is: p+p*d%

add them

step-by-step explanation:

idk you did not give the options or numbers so you cant solve it