3.option a (-8,2)
4.option b (5,4)
To determine how much of the wall is blue we first need to find its area. The wall is a rectangle, then its area is the product of its height and length:

Hence, the area of the wall is 140 square ft. To determine how much of the wall is already painted we multiply this by 1/2, then:

Therefore, 70 square ft are blue.
Yes i believe thats it ok
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8x^2-50 is your answer hopes this helps