Astudent simplifies (6b + 4r) – (2b + r) and says that the result is 4b + 5r. explain the error and describe the correct steps to simplify the expression.

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?

What is the measure of angle x? answer

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me