Answer:
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Step-by-step explanation:
Answer: Isolate the variable by dividing each side by factors that don't contain the variable.
x= -7, -9
Here the given expression is

We need to find the value of y when x =3 . So we substitute the value of x in the given expression.

So when x=3, y=0.4 and that's the required answer.
Given:
Radius of the cone = 5 ft
Slant height of the cone = 21 ft
To find:
The surface area of the cone
Solution:
Surface area of cone formula:

where r is the radius and l is the slant height.




The surface area of the cone is 130π square feet.