I need help with this benchmark I'm really bad at math

Find the value of x for which abcd must be a parallelogram -9-6x x-30

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

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