Answer:
The length of the diameter is 18 cm
Step-by-step explanation:
In this question, we are asked to calculate the diameter of a right cylinder, given that the radius and the height are equal and given the value of the surface area.
Mathematically, the surface area of a cylinder can be represented by the equation;
A = 2 π r( r + h)
since r = h, we can say h = r
Thus, the equation becomes;
A = 2 π r( r + r)
A = 2 π r(2r)
A = 4 π r^2
From the question, we can see that the value of A = 324 π
substituting this, we have;
324 π = 4 π r^2
4r^2 = 324
r^2 = 324/4
r^2 = 81
r = root of 81
r = 9 cm
The value of the diameter is two times the radius
Hence D = 2r = 2 * 9 = 18 cm
<span>✡
Answer: x=6.72 </span><span>✡
- - Solve:
</span><span><span>- - First step is to cross-multiply:
</span>- </span><span>

-

- - The next step is to divide both sides by the number </span><span>7.5
-

</span>
<span>- - x=6.72</span>
✡Hope this helps<span>✡</span>
Answer:
A really out of focus picture, but I think this might be what you want.
Step-by-step explanation:
The student wrote the wrong operation. "The sum of 5y and 3" translates to 5y+3. And here means addition.
Have you used the length*width*height?