The y intercept is always c (-5) and to the axis of symmetry u do -b/2a which is -1 and the vertex is (-1,10) because u pug in -1 into the equation. lmk if it’s right!
So 40=100% find 100%-30%=70% 70% of 40 'of' can be translated to multiply 70% times 40 percent means parts out of 100 so 70%=70/100=7/10=0.7 so .7 times 40=28 the sale price=$28
