The number of subsets of {5, 20, 0, 7}

16

Step-by-step explanation:

(  ) ,(5),(20),(0),(7),(5,7),(5,20,(5,0),(20,0),(20,7),( 0,7)     (5,20,0),(5,20,7),(20,0,7),    , (5,0,7) , (5 ,20,0 ,7)

a

step-by-step explanation:

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%