Find two numbers with a sum of 20 and a difference of 14

Mathematics

1 answer:

sergey [27]3 years ago

4 0

Find two numbers with a sum of 20 and a difference of 14

Make two equations

X+Y=20

X-Y=14

Now add x since y cancels out and add 20+14 To end up with

2x=34

Now divide 2 both sides to get x alone

2x/2=34/2

X=17

Now substitute x answer to first equation and solve for y

17+y=20

Subtract 17 both sides

Y= 3

Your two numbers are

3 and 17

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The mean is given by the sum of the data divided by the number of data (4, in this case):
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2) Standard deviation
The standard deviation is given by:
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4 years ago

Not sure how to go at this at all, please help.

ss7ja [257]

Here ya go answer down below