On a farm, there are 20 fewer cows than twice the number of pigs. if there are 50 cows, how many pigs are there?

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?

25 ! i need asap! ! ill mark brainliest!

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25