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goldfiish [28.3K]
3 years ago
8

14x+7y=217 14x+3y=189

Mathematics
1 answer:
kondor19780726 [428]3 years ago
4 0

Answer:

y = 7

x = 12

Step-by-step explanation:

14x+7y=217, then 14x = 217 - 7y

14x+3y=189, then 14x = 189 - 3y

217 - 7y = 189 - 3y

add 7y to each side of the equation:

4y + 189 = 217

subtract 1890 from each side:

4y = 28

divide both sides by 4:

y = 7

14x + 3(7) = 189

subtract 21 from each side:

14x = 168

divide both sides by 14:

x = 12

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8 0
3 years ago
Find the percentage of students that scored higher than 95.5. Round your answer to the nearest percent.
My name is Ann [436]

Answer:

\% Change = \frac{9}{64} *100 = 14.0625\% \approx 14\%

So then we have approximately 14% of the values higher than 95.5

Step-by-step explanation:

For this case we assume that the info is given on the figure attached.

From this figure we have the following frequencies for each class

Class                  Frequency

___________________________

70.5-75.5                13

75.5-80.5                7

80.5-85.5                6

85.5-90.5                10

90.5-95.5                19

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____________________________

Total                        64

So we have a total of 64 values and we want to find the percentage of students that scored higher than 95.5 so we can use the formula of relative change and we got:

\% Change = \frac{9}{64} *100 = 14.0625\% \approx 14\%

So then we have approximately 14% of the values higher than 95.5

6 0
4 years ago
What is the solution to this equation 6(x-4)+7=-5
sweet [91]

Answer:

X= 2

Step-by-step explanation:

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6x = 12 then divide 12 by 6

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3 years ago
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