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The answer to this is D. -7x^3-21x^2+14x.
Hi Kaeruno,
The radius of the stool is 21 cm. To find the circumference, multiply this by 2 pi, since multiplying by 2 gives you the diameter and multiplying <em>that</em> by pi give the circumference.
2pi * 21cm
= pi * 2 * 21cm
= pi * 42cm
= (22/7) * 42cm
= 924/7 cm
= 132 cm.
The circumference is 132 cm.
If you have any further questions, feel free to message me!
Sincerely, taeuknam.
They way how you put it looks confusing sorry
Perimeter of a triangle = all 3 sides added together
x + (x - 4) + (x - 4) = 19
3x - 8 = 19
3x = 19 + 8
3x = 27
x = 27/3
x = 9 <==