The x becomes negative because the negative sign at the start of the parenthesis distributes to everything inside parenthesis so x becomes -x and the double negative becomes +6 so that is why
To find surface area, we can use the equation:
SA=2lw+2wh+2lh, where:
l=10 in
w=3 in
h=7 in
SA=(2)(10)(3)+(2)(3)(7)+(2)(10)(7)
SA=60+42+140
SA=242 in²
A: you need to know how many cars you wash an hour. A reasonable amount would be five cars an hour making the equation 24•5=120$
B: you need to know how much the baking molds cost, a reasonable amount would be 7.50, the equation would be 7.50•5=37.5
Hope this helps
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We need more information. You don't give us enough information....? Provide an image please. Or at least name the polynomials...
