How would i determine weather the parabola y equals negative x to the second power minus x plus 6 opens upward or downward

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

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

Me find the value of x each figure.