For his long distance phone service, david pays an $8 monthly fee plus 6 cents per minute. last month, david's long distance bill was $14.18. for how many minutes was david billed?

The table above shows approximate conversions from gallons to liters. what is the value of x?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?