A game show contestant earns y dollars for completing a puzzle in x minutes. This situation is represented by the equationy=-250x + 5000 . How long did a contestant who earned $500 take to complete the puzzle? The contestant completed the puzzle in minutes. ustifi

Dental billing The billing schedule for dental X-rays specifies a fixed amount for the office visit plus a fixed amount for each X-ray exposure. If 2 X-rays cost 37 and 4 cost 54, find the cost of 5 exposures.

Due to the drought in California, many communities now have tiered water rates. There are different rates for Conservation Usage, Normal Usage and Excessive Usage. The usage is measured in the number of hundred cubic feet (hcf) the property owner uses. During the summer, a property owner will pay $24.72 plus $1.32 per hcf for Conservation Usage. The bill for Conservation Usage would be between or equal to $31.32 and $52.12. How many hcf can the owner use if she wants her usage to stay in the conservation range?