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.

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?