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3 years ago

12

Find 54 is 90% of what number

2 answers:

aleksandrvk [35]3 years ago

4 0

54=.9x Solve for x. x=54/.9=60

Olenka [21]3 years ago

4 0

Ratio and proportion

54/90=x/100
cross multiply
90x=5400
x= 60

hope this helps

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Solve the system by elimination.(show your work)

PilotLPTM [1.2K]

Answer:

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Step-by-step explanation by elimination:

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Subtract equation 1 from equation 2:

{-(2 x) + 2 y + 3 z = 0 | (equation 1)

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Multiply equation 2 by -1:

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Swap equation 2 with equation 3:

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Subtract 3/5 × (equation 2) from equation 3:

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Multiply equation 3 by 5/8:

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0 x+0 y+z = 0 | (equation 3)

Subtract 2 × (equation 2) from equation 1:

{-(2 x) + 0 y+3 z = -2 | (equation 1)

0 x+y+0 z = 1 | (equation 2)

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Subtract 3 × (equation 3) from equation 1:

{-(2 x)+0 y+0 z = -2 | (equation 1)

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Collect results:

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