Find the sum: (x3 + 4x2 + 2x - 6) + (5x - 7x2 + 3) A. x3 - 3x2 + 7x + 3 B. x3 - 3x2 + 7x - 3 C. x3 + 3x2 + 7x - 3 D. x3 - 3x2 + 3x - 3

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step-by-step explanation:

is means division by fractions

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

i think the length is 12 and the width is 17