what is an coefficient? I bet you guys on here could explain it better and how do I find out what the coefficients are?

The perimiter of a rectangle is 70 inches the legneth of the rectangle is 5 less than 3 times the width of the rectangle what is the width of the rectangle

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square