3. Mr. Li's classroom has a perimeter of 90 feet. The length of the room was 15 feet shorter than twice the width. Using algebra, determine the dimensions of the classroom. Show your work. (Remember, the dimensions of a rectangle are length and width.)

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4

To start to solve the system of equations below, which number would you multiply in the equation -2x-5y=-1? the two equations are -2x-5y=-1 and 4x+2y=8