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Find x, where x cm is the length of the side of the square which must be removed from each corner of the cardboard.

this is what i did, i went (9-2x)*(7-2x)=35, then i get it in a form of a quad or cubic, then find the x-intercepts?

2. From a rectangular sheet of metal, ABCD, the part ABP is cut, and the area of the remaining part is 114 cm2.

Find the value of x.

i am totally lost i dont know what to do here

3. The demand, x units of a certain product is given by x = 400 - 0.25p per month

where p is the selling price per unit. The cost, $C, to produce x units is given by

C = 9600 + 1200x

a) Express p in terms of x.

yeah this one i did. p=4 (400 - x)

b) The revenue obtained is a result of selling a number of units at a certain price.

Express the revenue, R, in terms of x.

totally lost, do i just use the x= 400 - 0.25p , and sub p from previous example in?

d) Determine the number of units that must be produced and sold each month :

i) in order to break even

i have to use the c= formula and find the x-intercepts?

ii) if the profit is to be $300 per month.

totally lost here

c) Express the profit, P, in terms of x.

profit... how do i do that?