18. need help with this cone question

answer

given

v=2100cm³

h=3r

v=1/3πr²h

soln

v=1/3πr²h

2100cm³=1/3×π×r²×3r( you will insert 3r in the place of h.)

2100cm³=3π/3×r³(cancel 3 by 3)

2100cm³= πr³

r³=2100cm³/3.14 ( π=3.14)

¾r³=¾2100cm³/3.14(I make them cube root.sorry I can't use the real cube root so I replace it by ¾)

r=8.74…

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !