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2 years ago

Help me with the 2 problems

Mathematics

2 answers:

denpristay [2]2 years ago

7 0

Yes because 484 + 484 equals 964
And equation you should always do the opposite of the sign you get to find your answer so he got minus he should use Addition

Vlad1618 [11]2 years ago

6 0

he has to put -484 to the left of the equal sign too

z + 484 -484 = 964 - 484

z = 480

10.

310,000 + x = 465,000

x = 465,000 - 310,000

x = 155,000

310,000x = 930,000

x = 930,000 ÷ 310,000

x = 3

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riadik2000 [5.3K]

Let

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$\dfrac2{3(1-r)^2} = \dfrac1{(1-r)(1+r)}$

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$\dfrac2{3(1-r)} = \dfrac1{1+r} \implies \dfrac{1-r}{1+r} = \dfrac23 \implies r = \dfrac15$

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$\dfrac a{1-r} = \dfrac a{1-\frac15} = 15 \implies a = 12$

and so the sum we want is

$ar^3 + ar^4 + ar^6 + \cdots = 15 - a - ar - ar^2 = \boxed{\dfrac3{25}}$

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3 years ago

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