(a+b )(d+e) factors and each factor

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

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

Lines b and c are parallel. what is the measure of 2? m2 = 31° m2 = 50° m2 = 120° m2 = 130°