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 ?

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

Step-by-step 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

a. the are of the rectangle is 18.25

b. 18.25 times two is 36.50

rae me : d

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)