Answer: 0.6274
Step-by-step explanation:
Given: The proportion of patients experience injection-site reactions with the current needle : p=0.11
Sample size : n= 4
Let x be a binomial random variable that represents the people get an injection-site reaction.
Binomial probability formula: 
The required probability : P(x=0)

Hence, the probability that none of the 4 people get an injection-site reaction = 0.6274
It's difficult to make out, but I think the task is to expand

Write the number in polar form first:

By DeMoivre's theorem, you have

and converting back to Cartesian form, this number is equivalent to
Radius of the pan = 16cm
Formula for area of circle:

Find the area of the pan:

9(2x4y2)3(3x5y3)4
=72x12y681x20y12
=7281x8y6
=89x8y6
Answer:
I think it is 1.5
Step-by-step explanation:
I'm not that sure sorry :(