3 years ago

Help me please and thank you!

Mathematics

1 answer:

mamaluj [8]3 years ago

8 0

7^6 is the correct answer

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Simplify the surd 3√ 20 +√ 45

melisa1 [442]

Answer:

9 $\sqrt{5}$

Step-by-step explanation:

Using the rule of radicals

$\sqrt{a}$ × $\sqrt{b}$ ⇔ $\sqrt{ab}$

Simplify the radicals

$\sqrt{20}$

= $\sqrt{4(5)}$

= $\sqrt{4}$ × $\sqrt{5}$

= 2 $\sqrt{5}$

$\sqrt{45}$

= $\sqrt{9(5)}$

= $\sqrt{9}$ × $\sqrt{5}$

= 3 $\sqrt{5}$

Then

3 $\sqrt{20}$ + $\sqrt{45}$

= 3(2 $\sqrt{5}$ ) + 3 $\sqrt{5}$

= 6 $\sqrt{5}$ + 3 $\sqrt{5}$

= 9 $\sqrt{5}$

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2 years ago

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fredd [130]

The number is 79 that is prime

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3 years ago

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To which subset of real numbers does the number one-fifth belong?

vredina [299]

The answer is B, rational numbers :)

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3 years ago

What is -65 x -2? 5j + 10j?

dolphi86 [110]

They are both simple exercises in addition.
The solutions are:

(-65) x (-2) = 130

(5j) + (10j) = 15j

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3 years ago

PLEASE HELP!!! The side lengths of a square are each 5q. By adding 3 to the length and subtracting 3 from the width, a rectangle

Oksanka [162]

Answer:

Option C

Step-by-step explanation:

When you put the write the scenario in an equation, it'll look like

(5q+3)(5q-3) for the new width times the new length

Factor these, and you shall get 25q^2+15q-15q-9. Simplify that into

25q^2-9

8 0

3 years ago

Help me please and thank you!​

Help me please and thank you!