Answer:

Step-by-step explanation:
Given that:
at y = 0 , x = 1
Then:
Area = 
Area = 
Area = 
Then:



![\overline x = \dfrac{5}{3} \ [\dfrac{3}{8}x^{8/3}]^1_0](https://tex.z-dn.net/?f=%5Coverline%20x%20%3D%20%5Cdfrac%7B5%7D%7B3%7D%20%5C%20%5B%5Cdfrac%7B3%7D%7B8%7Dx%5E%7B8%2F3%7D%5D%5E1_0)


Similarly;







Thus; 
Just addum up.
You should get the sum of 1.981 .
That's in standard form.
The formula for circumference is 2

r, where r is equal to radius.
It states to use 3.142 for pi
It also provides you with the diameter, not the radius, so you have to divide it by two to get 4.5
2*3.142*4.5= approximately 28.278 or 28.3
Step-by-step explanation:
8.35 < 3x + 18.75
3x + 18.75 > 8.35
3x > 8.35 - 18.75
3x > -10.4
x > -3.47