Sam ran several errands and used 7 gallons of gas. There were 5 gallons left in the tank. (Use g as a variable.)

Step-by-step explanation:

Given

Required

Determine the additional gallons used (g)

This is calculated as:

So, we have:

Make g the subject

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.