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Lina20 [59]
2 years ago
13

I’m lost on how to make r the subject for this equation

Mathematics
2 answers:
andriy [413]2 years ago
7 0

Answer:

Step-by-step explanation:

A = πr²

Dividing by π

A/π = r²

Finding the square root of both side

√r² = √(A/π)

r = √(A/π)

Fofino [41]2 years ago
7 0

Answer:

Step-by-step explanation:

A = πr²

r²= Aπ

r= √Aπ

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awwww shoot I really don't know know but I can maybe at least try to help you out and get some help to help you. I really don't make sense awww me

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3 years ago
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Math question #1 please show steps
-Dominant- [34]

Answer:

C

Step-by-step explanation:

An approximation of an integral is given by:

\displaystyle \int_a^bf(x)\, dx\approx \sum_{k=1}^nf(x_k)\Delta x\text{ where } \Delta x=\frac{b-a}{n}

First, find Δx. Our a = 2 and b = 8:

\displaystyle \Delta x=\frac{8-2}{n}=\frac{6}{n}

The left endpoint is modeled with:

x_k=a+\Delta x(k-1)

And the right endpoint is modeled with:

x_k=a+\Delta xk

Since we are using a Left Riemann Sum, we will use the first equation.

Our function is:

f(x)=\cos(x^2)

Therefore:

f(x_k)=\cos((a+\Delta x(k-1))^2)

By substitution:

\displaystyle f(x_k)=\cos((2+\frac{6}{n}(k-1))^2)

Putting it all together:

\displaystyle \int_2^8\cos(x^2)\, dx\approx \sum_{k=1}^{n}\Big(\cos((2+\frac{6}{n}(k-1))^2)\Big)\frac{6}{n}

Thus, our answer is C.

*Note: Not sure why they placed the exponent outside the cosine. Perhaps it was a typo. But C will most likely be the correct answer regardless.

5 0
3 years ago
PLEASE HELP!! I NEED HELP WITH THIS PROBLEM ASAP!! IF YOU HELP I'LL GIVE U BRAINLIEST!
I am Lyosha [343]

Let the amount Tom does = x

Then Larissa’s time would be 3x( 3 times the amount of Tom)

And Neal would also be 3x

The total of the 3 is 84 hours so as an equation you have:

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Tom = x, so Tom exercised for 12 hours.

8 0
3 years ago
If x = 9, what is the value<br> of 7x + 4?
Vika [28.1K]

Answer:

67

Step-by-step explanation:

7x9=63

63+4=67

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Answer:

32.1. It has the least values in the decimal place. Overall, it's 31.00, but the least decimal value is 32.1

Step-by-step explanation:

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