Answer:
Widgets should be sold by $38.88 to maximize the profit.
Step-by-step explanation:
Vertex of a quadratic function:
Suppose we have a quadratic function in the following format:

It's vertex is the point 
In which


Where

If a<0, the vertex is a maximum point, that is, the maximum value happens at
, and it's value is
.
In this question:
The profit is given by:

Which is a quadratic function with 
The maximum profit happens at the x of the vertex. Thus

Widgets should be sold by $38.88 to maximize the profit.
Answer:
49 pie
Step-by-step explanation:
Area of a circle is pie(radius squared)
radius is half diameter
I think it's 60 I'm NOT sure. I just multiplied those three numbers
The ratio between the masses of Jupiter and Venus is

We can separate the coefficient and the powers of ten:

Use the exponent rule

to simplify the powers of 10:

So, the ratio is

So, Jupiter has a mass that is approximately 400 times greater than Venus's.