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Marina CMI [18]
3 years ago
7

Please HELP, ASAP!

Mathematics
1 answer:
Natasha_Volkova [10]3 years ago
3 0
Idk u tell me cause im not the one
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The sum of three numbers is 11. the first number minus the second plus the third is 5. the first minus the third is 1 more than
Anestetic [448]
X+y+z=11, x-y+z=5, x-z=y+1 and solve it by any of the methods: isolation, elimination or determinants. isolation (or back substitution, would be for instance: z = 11-x-y, z=5-x+y, z = x-y-1 and then impose z=z:
11-x-y=5-x+y,
11-x-y=x-y-1,

The first takes you to: 6=2y or y=3, then the second to 12=2x or x=6, so that:

x=6, y=3, z=2.

You can see that it checks out

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3 years ago
Alexandra bought a $90000 life insurance policy at $10.98 for a 20 year term. She will pay ___ over 20 years for the premium
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Write the equation in standard form. Then factor the left side of the equation.
allsm [11]
X=3/2, -5 is that what u are asking for
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How do you find the y-intercept for x = 2y2 + 3y + 1
malfutka [58]

The y intercept is when x=0.  That's solving the quadratic

0 = 2y² + 3y + 1 = (2y + 1)(y + 1)

y = -1 or 2y+1=0 so y=-1/2

Two y intercepts, (0,-1) and (0,-1/2)

Answer: -1 and -1/2

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Which of the following is not an acceptable form of proof?
kolbaska11 [484]
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