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babunello [35]
3 years ago
13

The value of y varies directly with x. When y = 25, x = 6 1/4. What is the value of y when x is 12? 4

Mathematics
1 answer:
elena-14-01-66 [18.8K]3 years ago
6 0

Answer:

Step-by-step explanation:

if y = 25 when x = 6 1/4, then when y = 12, that would mean that we divided 25  by 2.0833. So we can do 6 1/4 divided by 2.0833 is the answer which is 3.00004800077.

(i think)

(probably wrong)

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72 is what percent of 240 ?
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Answer:

72 = 30%

Step-by-step explanation:

240 = 100%

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Let me know if I got it wrong :)

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Answer:

\boxed{x = 7, y = 9, z = 68}

Step-by-step explanation:

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I will use these three:

\begin{array}{lrcll}(1) & 8x + 13y +7 & = & 180 & \\(2)& 9x - 7 + 13y +7 & = & 180 & \\(3)& 8x + 5y - 11 + z & = & 180 &\text{We can rearrange these to get:}\\(4)& 8x + 13y & = & 173 &\\(5) & 9x + 13y & = & 180 & \\(6)& 8x + 5y + z & = & 169 & \\(7)& x & = & \mathbf{7} & \text{Subtracted (4) from (5)} \\\end{array}

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\boxed{\mathbf{ x = 7, y = 9, z = 68}}

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