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3 years ago

Plz help I'm will give a brainliest

Mathematics

1 answer:

Marysya12 [62]3 years ago

3 0

Answer:

A) 62.8cm^2

Step-by-step explanation:

A=πr^2 area of the big circle 113.1 minus the small circle 50.27 113.1-50.27=62.83

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Joelle walked 2/5 of the way from her house to school. Franco also walked 2/5 of the way from his house to school. Joelle and Fr

gulaghasi [49]

Answer:

I think they both have the same amount walked, therefore they are both considered as they have walked the same distance

Step-by-step explanation:

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3 years ago

The moon is 240,000 from the earth. What is the distance as a whole number multiplied by a power of ten?

Lera25 [3.4K]

24 to the power of 4 24x10x10x10x10 = 240,000 If you thought this answer was helpful, please mark it as brainliest. I would greatly appreciate it!

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3 years ago

In a class of 25 students, 20 have a brother and 8 have a sister. There are 3 students

kaheart [24]

Answer: 6/8 or 3/4 or 0.75

Step-by-step explanation:

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3 years ago

Rationalize the denominator of $\frac{5}{2+\sqrt{6}}$. The answer can be written as $\frac{A\sqrt{B}+C}{D}$, where $A$, $B$, $C$

horrorfan [7]

Answer:

$A +B+C+D = 3$ is the correct answer.

Step-by-step explanation:

Given:

$\frac{5}{2+\sqrt{6}}$

To find:

$A+B+C+D = ?$ if given term is written as following:

$\frac{A\sqrt{B}+C}{D}$

<u>Solution:</u>

We can see that the resulting expression does not contain anything under $\sqrt$ (square root) so we need to rationalize the denominator to remove the square root from denominator.

The rule to rationalize is:

Any term having square root term in the denominator, multiply and divide with the expression by changing the sign of square root term of the denominator.

Applying this rule to rationalize the given expression:

$\dfrac{5}{2+\sqrt{6}} \times \dfrac{2-\sqrt6}{2-\sqrt6}\\\Rightarrow \dfrac{5 \times (2-\sqrt6)}{(2+\sqrt{6}) \times (2-\sqrt6)} \\\Rightarrow \dfrac{10-5\sqrt6}{2^2-(\sqrt6)^2}\ \ \ \ \ (\because \bold{(a+b)(a-b)=a^2-b^2})\\\Rightarrow \dfrac{10-5\sqrt6}{4-6}\\\Rightarrow \dfrac{10-5\sqrt6}{-2}\\\Rightarrow \dfrac{-5\sqrt6+10}{-2}\\\Rightarrow \dfrac{5\sqrt6-10}{2}$

Comparing the above expression with:

$\frac{A\sqrt{B}+C}{D}$

A = 5, B = 6 (Not divisible by square of any prime)

C = -10

D = 2 (positive)

GCD of A, C and D is 1.

So, $A +B+C+D = 5+6-10+2 = \bold3$

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3 years ago

Convert 86 to a z-score

Semmy [17]

Answer:

Step-by-step explanation:--0.9

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3 years ago

Plz help I'm will give a brainliest​

Plz help I'm will give a brainliest