Write two different expressions to represent the perimeter of this square. what can you conclude from the two expressions? express your answer in two or more complete sentences.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

The distributive property allows you to say that 3(x − 1) = 3x −

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?