Answer:
39
Step-by-step explanation:
13 + 13 + 13 = 39
13 · 3 = 39
let X equal initial string length
X / 16 = 7.3
X = 7.3 * 16
X = 116.8
Answer: 385
Given: error: 6 months, standard deviation = 5 years is 60 months
Step 1: find the minimal sample size ‘n’ for 95% confidence interval
1-0.95= 0.05
0.05/2= 0.025
Step 2:
1-0.025= 0.975
View attachment for more steps
-5(11-3t) = -6t -4
distribute -5 to the parentheses
-55+15t = -6t -4
isolate t; add -6t from both sides
-55+21t = -4
add 55 from both sides
21t = 51
divide t
t = 2.4 (rounded)
D looks like the best answer