A beach umbrella has a circumference of 8.8 feet what is the radius of an umbrella?

radius = 1.4

Step-by-step explanation:

The formula for circumference is as follows:

or

However, these formulas are the same, because the diameter is equal to the radius times 2. I prefer to use the first (it gives you less values to work with).

Anyhow, We would substitute like this:

We know that pi, is going to be equal to: 3.14159

So we work from there...

Diameter divided by 2 would be the radius, and thats:

1.4006

or 1.4

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204