Answer:
The correct answer is:
D= ![\sqrt{\frac{2.5 h}{N} ]](https://tex.z-dn.net/?f=%5Csqrt%7B%5Cfrac%7B2.5%20h%7D%7BN%7D%20%5D)
Step-by-step explanation:
We have the equation
h = D^2N /2.5 (1)
We have to clear the equation for (1). Multiplying (1) by 2.5
2.5 h = D^2 N (2)
Dividing (2) by N,
= D^2 (3)
By taking the square root of (3), finally we have
= D
<em>a. 2√21 units</em>
- <em>Step-by-step explanation:</em>
<em>Hi there ! </em>
<u><em>Area formula</em></u>
<em>A = π·r²</em>
<em>84π = πr²</em>
<em>r² = 84π/π</em>
<em>r² = 84</em>
<em>r² = 2²×3×7</em>
<em>r = √2²×3×7</em>
<em>r = 2√3×7</em>
<em>r = 2√21</em>
<em>Good luck !</em>
Changing those words into an equation, we get:
7+3x = 19
Subtract both sides by 7
3x = 12
Divide both sides by 3
x = 4
That number is 4. Have a nice day! :)
Answer:
the answer is 75
Step-by-step explanation:
i hope this right