Put brackets in the following to make it correct5-2x2+2x7-5

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

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?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'