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garri49 [273]
2 years ago
5

120% of what number is 102 and how do you write the question? (Include a variable)

Mathematics
1 answer:
Nostrana [21]2 years ago
4 0

Answer:

y = 85

Step-by-step explanation:

120% times y = 102

That's how you write the equation.

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Answer:

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3 years ago
Solve for x, y, and z
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Answer:

The solution is x=1,y=2,z=3

Step-by-step explanation:

The given system of equations is ;\

2x−3y+4z=8...(1)

3x+4y−5z=−4...(2)

4x−5y+6z=12...(3)

Make x the subject in equation (1)

x=\frac{8+3y-4z}{2}...(4)

Put equation (4) into equation (2) and (3)

3(\frac{8+3y-4z}{2})+4y-5z=-4

Multiply through by;

3(8+3y-4z)+8y-10z=-8

Expand;

24+9y-12z+8y-10z=-8

Simplify;

17y-22z=-32...(5)

Equation (4) in (3)

4(\frac{8+3y-4z}{2})-5y+6z=12

2(8+3y-4z)-5y+6z=12

16+6y-8z-5y+6z=12

y-2z=-4

y=2z-4...(6)

Put equation (6) into equation (5)

17(2z-4)-22z=-32

34z-68-22z=-32

34z-22z=-32+68

12z=36

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Put z=3 into equation (6)

y=2(3)-4=2

Put y=2 and z=3 into equation 4

x=\frac{8+3(2)-4(3)}{2}=1

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3 0
3 years ago
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Step-by-step explanation:

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Answer:

A

Step-by-step explanation:

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5 0
3 years ago
5 multiplied by what= -1?
nadya68 [22]
-1/5 multiplied by 5 =-1

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