Answer:

Step-by-step explanation:
Lets use the compound interest formula provided to solve this:

<em>P = initial balance</em>
<em>r = interest rate (decimal)</em>
<em>n = number of times compounded annually</em>
<em>t = time</em>
First, change 6% into a decimal:
6% ->
-> 0.06
Since the interest is compounded semi-annually, we will use 2 for n. Lets plug in the values now and your equation will be:

50 is 46.82 rounded to the nearest ten
Answer:
The probability that their mean life will be longer than 13 years = .9943 or 99.43%
Step-by-step explanation:
Given -
Mean
= 15 years
Standard deviation
= 3.7 years
Sample size ( n ) =22
Let
be the mean life of manufacturing items
the probability that their mean life will be longer than 13 years =
=

= 
=
Using Z table
= 1 - .0057
= .9943
Answer:
-72rs
Step-by-step explanation:
-6r(12s)
Remove Parentheses:
-6r*12s
Multiply the Numbers:
-6*12=-72
Put the variables back in:
-72rs
Answer:
2.1inches
Step-by-step explanation:
3.4+1.7+x=7.2
5.1+x=7.2
x=7.2-5.1
x=2.1