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2 years ago

12

I need help and if you can explain it would help alot!

1 answer:

GalinKa [24]2 years ago

7 0

The answer if kind of good but it is messed up because let’s think together if we can find M how

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three bells ring at the intervals of 10 minutes and 20 minutes if they all ring together at 10 clock when will they ring togethe

mario62 [17]

Answer:The LCM of 10, 15, and 20 is 60. After 60 minutes, they ring together again.

Step-by-step explanation:

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3 years ago

Anna said that the product of 7/8x 1/2=7/2

artcher [175]

Ana is false. The answer is 7/16 because 7*1=7 and 8*2=16

7 0

3 years ago

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Margaret bought 40 ounces of bananas for $5.00. How much did Robert pay for 12 ounces?

Brrunno [24]

It’s 57.23 dhe paided for

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3 years ago

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If a = √3-√11 and b = 1 /a, then find a² - b²

Serga [27]

If $b=\frac1a$ , then by rationalizing the denominator we can rewrite

$b = \dfrac1{\sqrt3-\sqrt{11}} \times \dfrac{\sqrt3+\sqrt{11}}{\sqrt3+\sqrt{11}} = \dfrac{\sqrt3+\sqrt{11}}{\left(\sqrt3\right)^2-\left(\sqrt{11}\right)^2} = -\dfrac{\sqrt3+\sqrt{11}}8$

Now,

$a^2 - b^2 = (a-b) (a+b)$

and

$a - b = \sqrt3 - \sqrt{11} + \dfrac{\sqrt3 + \sqrt{11}}8 = \dfrac{9\sqrt3 - 7\sqrt{11}}8$

$a + b = \sqrt3 - \sqrt{11} - \dfrac{\sqrt3 + \sqrt{11}}8 = \dfrac{7\sqrt3 - 9\sqrt{11}}8$

$\implies a^2 - b^2 = \dfrac{\left(9\sqrt3 - 7\sqrt{11}\right) \left(7\sqrt3 - 9\sqrt{11}\right)}{64} = \boxed{\dfrac{441 - 65\sqrt{33}}{32}}$

5 0

2 years ago

Hi plz halp me I don’t understand and plz do step by step

miv72 [106K]

First multiply (4x5)
Then find 2 cubed = 2x2x2= 8
Then divide 20 by 2= 20/2=10
Then 10-8= 2

7 0

3 years ago