What is the solution x+2y=7 and x-2y=-1

Normal yağmur ile asit yağmuru arasındaki fark nedir

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

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?