o=nickel
O=quarter
O O O O O O O O O O + o o o =2.65
(2.50+.15=2.65)
there are 10 quarters total, and 3 nickels
Answer:

Step-by-step explanation:
The fundamental step would be to determine the values of p and E which i believe is the margin of error in this case. Consider the following two equations;

We simply add the two equations and solve for p;

We then substitute this value of p in either equation and solve for E;

Since we have both p and E, the confidence interval can thus be written as;

Answer:
15/x-2
Step-by-step explanation:
Cant attach the photo but you use a division table
Answer:
13c
Step-by-step explanation:
-2+15=13
13c
A=p (1+rt)
A future value ?
p Principle 900
R interest rate 0.06
T time 9/12
A=900×(1+0.06×(9÷12))
A=940.5