Answer:
a) 325.72
Step-by-step explanation:
A=4pir^2
A=4x3,14x7.2x7.2
a=651.44
1/2a=1/2x651.44
=325.72
Not understanding the question but slope-intercept form is y=mx+b
Answer:

So then the expected value in the long run for this case would be 19 millions
Step-by-step explanation:
Previous concepts
The expected value of a random variable X is the n-th moment about zero of a probability density function f(x) if X is continuous, or the weighted average for a discrete probability distribution, if X is discrete. And is defined as:

For 
Solution to the problem
Let's define the random variable X as the expected return for a new drug.
For this case we expected a return of X=750 millions with a probability of 0.14. We assume that p is the probability of success for this case p =0.14.
And the probability of no success on this case would be q = 1-p = 1-0.14 =0.86. And the cost associated for this case would be X= -100 million
If we use the definition of expected value we have this:

So then the expected value in the long run for this case would be 19 millions
Lets simplify each one of the rational expressions using the product rule of exponents:

and the quotient rule of exponents:

.
1.

2.

3.

4.
We can conclude that you should pair the rational expressions with their simplest form as follows:



Answer:
-8n+16. You can also put 16-8n