What is the slope of a line perpendicular to the line whose equation is 4x-5y=10

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?