Q: If 4x plus 12x equals 80 what does x equals?

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6x + 12x + 2x = 80 20x = 80 x = 4

24

Subtracting gives: 10x = 80 so x = 8 and y = 5

65

x=8 12x-16=80 add 16 to both sides of the equation 12x=96 divide both sides of equation by 12 x=8

240, since 80+80+80=240

94+94+80+80=348.

a) 4x+13y=40 b) 4x+3y=-40c) multiply b per(-1)=-4x-3y-40d) sum a and c: 4x+13y-4x-3y=40-(-40)=>10y=80 => y=8to find x replace y per its value in a or b and get x=-16

Use the quadratic equation formula to find the solutions to this equation.

The answer is 560. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.

80 + 8 = 88

80 + 50 = 130

2(x + 4)(x - 10)

Let l = x for the sake of clarity: 4x +39 = 14x -41 4x -14x = -41 -39 -10x = -80 x = 8 So: l = 8

245

31,880

200

190

80

4x24=96 20 x 4 = 80 4 x 4 = 16 80 + 16 = 96

1,162

80

80

Subtract 2x from each side: 30 = 10x - 50;Add 50 to each side: 80 = 10xDivide each side by 10: 8 = x

80+90+100=170+100=270