3 years ago

The difference of four times a number and seven is thirteen

Mathematics

1 answer:

Scrat [10]3 years ago

6 0

4n - 7 = 13

4n = 20
n = 5. Hope it helps!

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Sometimes it helps to draw it out...

(17)
C_______M_________Q
|___________________|
21

therefore, CM + MQ = CQ
17 + MQ = 21
MQ = 21 - 17
MQ = 4 <===

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$\\ \sf\longmapsto A=(1-4)-(2+1)$

$\\ \sf\longmapsto A=-3-3$

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$\\ \sf\longmapsto B=(3-\dfrac{1}{2})-(2-4)$

$\\ \sf\longmapsto B=\left(\dfrac{5}{2}\right)+2$

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$\\ \sf\longmapsto AB=-6\times \dfrac{9}{2}$

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$\\ \sf\longmapsto AB=-27$

$\\ \sf\longmapsto \dfrac{9}{2}\times (-6)$

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Observed:-

$\\ \sf\longmapsto AB=BA$

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