The first one is 1.12867 because you need to set it up like this.
4=3.14(x)squared
4/3.14=x(squared)
x=1.12867
The second one is done simply by multiplying it out.
A=3.14(3x)squared
A=3.14(9x[squared])
A=28.26x[squared] -The squared is referring to the x.
-10w - 400 = o
w= weeks
o = new outstanding balance
Depending on the wage so im just gonna use an example to help you
so lets say the wage is $15 per hour
you would multiply 15 by 4 and thers your answer, please state the wage
