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juin [17]
3 years ago
10

If x-5=2 then find the value of 6x-20

Mathematics
2 answers:
Alborosie3 years ago
7 0
First solve the first equation to find x.

x-5=2
x=7

Now plug it in to the other equation to get your answer.

6(7)-20
42-20
22

The answer is 22.
swat323 years ago
4 0
So x in the fist problem is 7. So the x is substituted be 7. guessing you want me  to solve,
6x-20
=6(7)-20
=42-20
=22

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3 years ago
Y is inversy proportional to x. When y=7 , x=9 A) work out an equation connecting y and x? B) work out the value of y when x=21
natita [175]

Answer:

see explanation

Step-by-step explanation:

since y is inversely proportional to x the equation relating them is

y = \frac{k}{x} ← k is the constant of proportionality

to find k use the given condition when y = 7, x = 9

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8 0
3 years ago
Given a mean of 150 and a standard deviation of 25:
pishuonlain [190]
We have to define an interval about the mean that contains 75% of the values. This means half of the values will lie above the mean and half of the values lie below the mean.

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In a Z-table, mean is located at the center of the data. So the position of the mean is at 50% of the data. So the position of point 37.5% above the mean will be located at 50 + 37.5 = 87.5% of the overall data

Similarly position of the point 37.5% below the mean will be located at 
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From the z table, we can find the z value for both these points. 12.5% converted to z score is -1.15 and 87.5% converted to z score is 1.15.

Using these z scores, we can find the values which contain 75% of the values about the mean.

z score of -1.15 means 1.15 standard deviations below the mean. So this value comes out to be:

150 - 1.15(25) = 121.25

z score of 1.15 means 1.15 standard deviations above the mean. So this value comes out to be:

150 + 1.15(25) = 178.75

So, the interval from 121.25 to 178.75 contains the 75% of the data values. 
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Vanyuwa [196]

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3 years ago
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