Mean simply means average
so just add them all up and divide by 5
22 + 37 + 49 + 15 + 71 = 195
195/5 = 39
mean = 39
Answer: a) $778.67 b) 19 years
Step-by-step explanation:
The formula you would use is

where a is the amount
n is the length of time
P is the principle
and r is the rate in decimal form
a)

b)
put your initial equation into a graphing calculator and use the table function to find that after 18 years it is worth 117 and in 19 years 86-
Answer:
The principal investment required to get a total amount, principal plus interest, of $400.00 from simple interest at a rate of 8% per year for 9 years is $232.56.
Step-by-step explanation:
Given
- Total accrued Amount A = 400.00 (Let say $)
- Interest rate r = 8% = 0.08
To determine
Principle P = ?
Using the formula
P = A / (1 + rt)
substituting A = 400.00, t = 9 and r = 0.08 in the formula
P = 400 / ( 1 + (0.08 × 9))
P = $232.56
Therefore, the principal investment required to get a total amount, principal plus interest, of $400.00 from simple interest at a rate of 8% per year for 9 years is $232.56.
Answer:
1 2/5
Step-by-step explanation:
1 3/5 = 8/5, 7/8 * 8/5 = 1.4
1.4 as a fraction is 7/5
Simplify it and you get 1 2/5
Let the first number = x
The second number would be 5x
The third number would be 100x
Add:
X + 5x + 100+x = 296
Simplify:
7x + 100 = 296
subtract 100 from both sides:
7x = 196
Divide both sides by 7
X = 196 / 7
X = 28
First number is 28
Second number is 28 x 5 = 140
Third number = 128