Last sunday a certain store sold copies of 256 newspaper a for $1.00 each and copies of newspaper b for $1.25 each, and the store sold no other newspapers that day. if r percent of the store's revenue from newspaper sales was from newspaper a and if p percent of the newspapers that the store sold were copies of newspaper a, which of the following expresses r in terms of p ?

D.

Step-by-step explanation:

let's call A the number of copies sold of newspaper A and B the number of copies sold of newspaper B.

So, we can formulate the following equations from the sentence: a certain store sold copies of 256 Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each as:

A + B = 256                               (1)

1A + 1.25 B = Total Revenue    (2)

Then, r and p are equal to:

    (3)

                           (4)

Isolating A from (4) and B from (1), we get:

               (5)

                        (6)

Finally, replacing (5) and (6) in (3), we get:

7 weeks

step-by-step explanation:

convert each fraction to the least common multiple of 20, so 3/4 = 15/20 & 1/10 = 2/20, then divide 15 by 2 and you get a little over 7, so the food will last 7 weeks.

what is

step-by-step explanation: