Find the value of c that will make 25x^2-40x+c a perfect square trinomial.

Find the area of a trapezoid with bases 14 cm and 18 cm and height 10 cm. 160 cm2 140 cm2 180 cm2 126 cm2

What is the standard form of -5x^2+2x^4-11+x^3+3x

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?