The number 9 in scientific notation is 8•10^0
It’s should be 12.04 after you do all the math and add it up
Think of this situation as a system of equations.
let y be the price of hotdogs
let x be the price of hamburgers
5y + 2x = 8
2y + 5x = 9.50
now use your solution method of choice
substitution, elimination, matrices, etc
Answer is 7.
55+5X=90
5X=90-55
5X=35
X=35/5
X=7
