Two coworkers picked up some writing instruments at
the office supply store. Ava
selected 9 boxes of pencils
and 4 boxes of ballpoint
pens, paying $30. Next, Tony
spent $39 on 6 boxes of
pencils and 9 boxes of
ballpoint pens. How much
does a box of each cost? using elimination method.

answer: options

step-by-step explanation:

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of