Let 
be the scores of the first 8 quizzes. We know that the average of these scores is 85, so we have
The average of the first 9 scores is 81, and it is given by
But we know that the sum of the first 8 is 680:
And we can solve for the nineth score: multiply both sides by 9:
Subtract 680 from both sides:
Answer:
5 years
Step-by-step explanation:
Interest earned ($) = Principal (amount $ invested) x Interest Rate (as a %) x Time (in years)
500 = 2500(.04)(t)
500 = 100t
t = 5 years
Answer:
B. and E.
Step-by-step explanation:
hope it helps ;)
1) 9+6 = 15
15+31 = 46
2) (12.5+0) + (1+43.5)
12.5+44.5
= 57
So answer to number 1 is 46
Answer to number 2 is 57
