6 units
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It descended 240 feet 12*20 is 240
Answer:
the value of x in x? (-8x = 24) - 6x +18 - 122 is x=40
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By adding the 1st and third equation together, you get rid of z and end with 7x+8y=13. The second equation will be the second equation and 2 times the first equation, so the will yield 3x+8y=1. Now, you solve this system of equations and get x3, y=-1, and z=-4