Answer:
Step-by-step explanation:
a=10
The probability is 4:20
It is correct because there are 20 students and there could be 4 guesses
Answer:
The interest is 
Step-by-step explanation:
we know that
The compound interest formula is equal to
where
A is the Final Investment Value
P is the Principal amount of money to be invested
r is the rate of interest in decimal
t is Number of Time Periods
n is the number of times interest is compounded per year
in this problem we have
substitute in the formula above

<em>Find the interest</em>

substitute
