Step-by-step explanation:
Each of the printing companies have their own advantages. APlus Printing has a lower setup fee and PrintMore has a lower cost for each poster printed. We can find out at what number of posters are the 2 costs the same.
Let x be the number of posters.
We have $20 + $0.1x = $55 + $0.05x.
=> $0.05x = $35
=> x = 700
Hence we can give a conclusion:
- If Elliot is printing less than 700 posters, he should use APlus Printing.
- If Elliot is printing more than 700 posters, he should use PrintMore.
- If Elliot is printing exactly 700 posters, he should use either company.
I’m pretty sure that C is the right answer. You can check it through if needed
Here are two slightly different ways to look at it.
Both ways do exactly the same thing.
<u>Way #1:</u>
Divide (the new number) by (the old number)
349 / 320 = 1.090625
Change the quotient 1.090625 to percent.
To change any number into percent, multiply it by 100, or move the decimal point 2 places to the right.
1.090625 ==> 109.06 %
The new number (349) is 109.06% of the old number (320).
But the old number was 100% of itself. So the new number
is <em>9.06% more</em> than the old number was.
================================
<u>Way #2:</u>
How much bigger is the new number ?
(349 - 320) = 29 bigger
Divide the increase by the old number:
29 / 320 = 0.090625
Change the quotient to a percent.
0.090625 = 9.06%
The <em>increase</em> is<em> 9.06%</em> of the old number.
Answer:
It is 7x=5
Step-by-step explanation:
H0: p = 0.15; HA: p > 0.15. ˆ
p = 0.25; z = 2.80; Pvalue
= 0.0026. The 95% confidence interval is
(0.165, 0.335).
We must assume the trees sampled
are a simple random sample of the trees in the area and are less than
10% of all trees in the forest. The results are
generalizable only to the Hopkins forest (or nearby if
the forest is viewed as representative). Because the
P-value is so low, we reject H0. There is strong
evidence that the proportion of trees damaged by
acid rain in the Hopkins forest is higher than the
15% average for the Northeast.