Ateacher had 21 red pens. if the ratio of red pens to blue pens she owned was 3: 1 , how many pens did she have in total

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%

Graph the system of equations. {6x−4y=−244x−8y=−32 use the line tool to graph the lines.

What is solution for the following system of equations, 2x+8y=4 and x=-3y+5 1) x=14 y=-3 2) x=2 y=-3 3) x=-3 y=-3 4)x=12 y=5