Y= 7x is that a direct variation or no

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab