Which choice is equivalent to the expression below? The square root of 20 minus the square root of 5+ the square root of 45

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Afootball is throw by a quarterback to a receiver

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.