25. Write an expression for the number of
gallons of paint needed for an area of A ft.

Multiply length x width to get the square footage of trim to be painted. Divide the total by 400 to get the number of gallons of paint you'll need for one coat. You'll likely need less than a gallon for a standard room, so consider buying trim paint in a quart or two

Step-by-step explanation: i don't know this is confusing

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.