Please need help in number 10 Thank you so much calculator d

calculator, detenmine tbe solutions he possible number of positive and negative ncal nesocs. Using a) )xs + 2x4-49x-98 = 0 9. Solve the inequslities. Be suze draw the mumber line and then state the sokurin in inseral sotati a) (-2x+1)(x +4)0x-5)

Solution

V= length*width*height

Let x square units cut at each corner

So height=x

V=(18-2x)(20-2x)x=4x³-76x²+360x

V\'=12x²-152x+360

Critical number,V\'=0

4(3x²-38x+90)=0

x=12,0.62

12cant be possible. Therefore x=0.62inch is the height for maximum volume

V(18-2*0.62)(20-2*0.62)0.62=194.94inches³