A triangle has side lengths of (4b-6c)(4b−6c) centimeters, (9b-d)(9b−d) centimeters, and (3d-c)(3d−c) centimeters. What expression represents the perimeter, in centimeters, of the triangle?

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Explain how you can use the associative property to evaluate (7x50)x4.

Which statement about the relative areas of δabc and δxyz is true? the area of δabc > the area of δxyz the area of δabc < the area of δxyz the area of δabc = the area of δxyz more information is needed to compare.