What is the simplified form of (−7x3 + 5x2 − x + 6) − (−8x3 + x2 + 3)?

What is the maximum total area that 450cm of string can enclose if it is used to form perimeters of two adjoining rectangles as shown?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?