A company finds that if it charges x dollars for a cell phone, it can expect to sell - 2x + 1000 phones. The company uses the function r
defined by r(x) = x(-2x + 1000) to model the expected revenue, in dollars,
from selling cell phones at x dollars each. Is Os sps
600 an appropriate
domain for the function r? Explain your reasoning.

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.