It would be irrational, as it has non repeating digits to the right of the decimal.
Answer:20
Step-by-step explanation:
<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>
Your answer should be y= -72
Idk if the hight is 9 units but if it is the answer is 1385.44 units cubed.