Jenna's band is going to record a CD at a recording studio. They will pay $250 to use the studio for one day and $90 per hour for sound technicians. Jenna has $100 and can reasonably expect to raise up to an
additional $350 by taking pre-orders for CDs.
Complete the explanation of how the inequality 100 < 250 + 90n < 450 can be used to find the number of
hours Jenna and her band can afford to use the studio and sound technicians.