Answer: first option
Step-by-step explanation:
The formula for calculate the surface area of a cone is the shown below:

Where: s is the slant height and r is the radius.
As you can see in the figure the slant height and the radius are:
s=18 cm and r=6 cm
Therefore when you substitute the values shown above into the formula, you obtain that the result is:
cm²
-13.4 is the answer. And this is simplified form
Answer:
Step-by-step explanation:
We can plug this into a formula and get

the .9075 comes from 1 - the depreciation value of 9.25% which converts to .0925 in decimal form.
? is what we are trying to solve for.
We can divide both sides by 19,700 and we get

so ? is about 13.
Answer:
4
Step-by-step explanation:
x = root under 5/2
so it is real and irrational number