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3 years ago

Select the pair of numbers that have:

Mathematics

2 answers:

lidiya [134]3 years ago

8 0

Answer:

The pair of numbers that has a sum of 45 and a difference of 5 is (B) 25 and 20.

Step-by-step explanation:

26 + 19 = 45 and 26 - 19 = 3

25 + 20 = 45 and 25 - 20 = 5

24 + 21 = 45 and 24 - 21 = 3

26 + 21 = 47 and 26 - 21 = 5

Studentka2010 [4]3 years ago

6 0

Answer:

Step-by-step explanation:

It is possible to solve this problem without using algebra and equations.

One number is 7 more than the other, but they add to 25.

If you subtract the difference of 7 first, you will be left with the sum of two equal numbers.

−

The one number is 9 and the other is 7 more than 9, so (9+7 = 16)

The numbers are 9 and 16.

Check: 9+16 = 25#

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Find the geometric sum: 40 + 20 + 10 + … + 0.078125

sveticcg [70]

$S=40+20+10+\cdots+0.078125$
$S=40\left(1+\dfrac12+\dfrac14+\cdots+\dfrac1{512}\right)$
$S=40\left(1+2^{-1}+2^{-2}+\cdots+2^{-9}\right)$

$2^{-1}S=40\left(2^{-1}+2^{-2}+2^{-3}+\cdots+2^{-10}\right)$

$\implies S-2^{-1}S=40\left(1-2^{-10}\right)$
$\implies\dfrac12S=40\left(1-\dfrac1{1024}\right)$
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eduard

Answer:

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Step-by-step explanation:

length=x

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Can anyone help me with this?

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Look at the attached picture ⤴

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