Question

1. the sum of the first n odd positive integers is 64. what is the value of n ?

2. a bookstore employee is given a 20% discount off the retail price of any book. assuming there is no tax, how many dollars does she pay for a book with a retail price of $55 ?


please please help i need the answers as soon as possible :(
i used all my points, sadly i only have 13

Answer 1

Explanation:

1. 64=1+3+5+7+9+11+13+15 that is a total of 8 odd numbers so n=8

2.((new-old)/old)×100%=percentual difference

so ((new-$55)/$55)×100%=20%

new-$55=$55×0.2

new=$55+$55×0.2=$66