Which quadratic equations has the solution set [-20,9] A. (x+20)(x-9)=0
B. (x-20)(x+9)=0
C. (x-5)(x-4)=0
D. x^2-9x+20=0
E. x^2-11x+180=0
F. x^2+11x-180

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Acompany manufactures large valves, packed in boxes. a shipment consists of 1500 valves packed in 75 boxes. each box has the outer dimensions 1.2 x 0.8 x 1.6 m and the inner dimensions 1.19 x 0.79 x 1.59 m. the boxes are loaded on a vehicle (truck + trailer). the available capacity in the vehicle combination is 140 m3. each valve has a volume of 0.06 m3. - calculate the load factor on the box level (%). - calculate the load factor on the vehicle level (%). - calculate the overall load factor (%).