To start, this is an interest problem, meaning you will have to use I=prt where I is the total interest, p is the principle amount, r is the rate, and time is the amount of time in years. Since you know the principle rate is $1200, the rate is 3.9%, and the time is 8 months, you can plug this into the formula. However, keep in mind that you have to convert 3.9% to a decimal before putting it into the formula and the time must be represented in years. 3.9% represented as a decimal would be 0.039 and 8 months would be represented as 8/12 or 2/3 (since there are 12 months in one year). Now that you have this information, plug the values into the formula: i=(1200)(0.039)(2/3). When simplified, you get your answer as $31.20.
Answer:
c
Step-by-step explanation:
Since the figures are similar then the ratios of corresponding sides are equal, that is
= 
, substitute values
= 
( cross- multiply )
10YZ = 230 ( divide both sides by 10 )
YZ = 23 → c
Answer:
Option D:
Step-by-step explanation:
The formula for confidence interval is;
CI = x¯ ± z√σ
Where σ is population standard deviation.
Now, increasing the value of σ means that z√σ will increase and thus, the width of the confidence interval will in turn become wider since z√σ is added to and subtracted from x¯.
Correct answer is option D.
Answer:
7.647, 
, 
, 8.64
Step-by-step explanation:
Change all the fractions to decimal form to make this problem easy for yourself. as a fraction becomes 7.7 because when you divide by 10 we just move the decimal one place to the left. For , first express it as an improper fraction which will be 
and then when you divide this you get 7.76. From here you can determine the order from least to greatest.
