<span>I believe what you are looking for here is an expression. For this example, the cost of a pen will be represented by x. We know that a folder costs $1.15 more than a pen, so the cost of a folder will be represented by x+1.15. This question is asking for 6 pens, and so we multiply the cost of a pen (x) by 6 and get 6x. It also asks for 3 folders, and so we multiply the cost of a folder (x+1.15) by 3 and get 3(x+1.15). When you simplify that by multiplying the 3 by the x and then the 3 by the 1.15, you get 3x + 3.45. To get the total cost of 6 pens and 3 folders, add the two together for an answer of 6x + 3x+3.45. Simplify that by adding the two x's together and get 9x+3.45, where x is the cost of a pen.</span>
Answer in the pic. Use substitution.
The answer in standard form is 521,340,602.3
Answer:
41101.750 to 43898.250
Step-by-step explanation:
Using this formula X ± Z (s/√n)
Where
X = 42500 --------------------------Mean
S = 6800----------------------------- Standard Deviation
n = 64 ----------------------------------Number of observation
Z = 1.645 ------------------------------The chosen Z-value from the confidence table below
Confidence Interval Z
80%. 1.282
85% 1.440
90%. 1.645
95%. 1.960
99%. 2.576
99.5%. 2.807
99.9%. 3.291
Substituting these values in the formula
Confidence Interval (CI) = 42500 ± 1.645(6800/√64)
CI = 42500 ± 1.645(6800/8)
CI = 42500 ± 1.645(850)
CI = 42500 ± 1398.25
CI = 42500+1398.25 ~. 42500-1398.25
CI = 43898.25 ~ 41101.75
In other words the confidence interval is from 41101.750 to 43898.250
Answer:
30%
Step-by-step explanation:
In this question, we are to calculate the percentage of students who are female and do not play instruments.
We can first infer this from the table;
The number of females who do not play instruments = 64
The percentage of females who do not play instruments = number of females who do not play instruments/total number of students surveyed * 100%
That will be;
64/213 * 100% = 30.04 which is approximately 30%