Two customers went to a post office to buy postcards and large envelopes. Each postcard costs the same amount, and each large envelope costs the same amount. The first customer paid $6.00 for 14 postcards and 5 large envelopes.
The second customer paid $10.50 for 12 postcards and 15 large envelopes.

What was the cost in dollars of each large envelope?

it's

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500