I don't see any numbers to set up in an equation or letters
Answer:
x = -2
Step-by-step explanation:
Given :
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Cross multiplying the terms :
⇒ 8 (x + 4) = -16 (x + 1)
⇒ 8x + 32 = -16x - 16
⇒ 24x = -48
⇒ x = -2
The answer is 172. hope that helps
Answer:
Step-by-step explanation:
There are key notes here
- *95% confidence or 95% confidence interval*
This is a popular percentage used in finding a statistic (a statistic is a parameter or measure which has values). A 95% confidence interval for a parameter is a wide range of values within which the specific value of the statistic you're testing should lie or does lie. Remember that a range is an interval from a certain value to a higher value e.g. a range of/from (8 - 18). If the parameter you're testing is the mean (the numerical average of a group) for example and that is your range then it means that you are 95% certain (almost completely or almost 100% certain) that the population mean lies within that interval. In the case of this question, there are no numerical values for the mean (average)
- *true average*
True average means the true mean value for the population
- *an amount within the confidence interval*
In this case, we're comparing the mean/average for male workers and female workers so DIFFERENCE IN MEANS is the actual statistic we are looking at here. So, for (A)
(A) We are 95% confident that the difference in mean of blood lead level in male workers and female workers is an amount or value that lies within the confidence interval created
(B) Same as (A) above BUT here, we're testing that (our hypothesis is) the true mean blood lead level for male workers is LESS THAN that of female workers.
(C) If a conclusion cannot be drawn from the statistical information given, that means we can't find an accurate cause-and-effect relationship between the independent variable(s) and dependent variable(s)
(D) Here, our hypothesis (what we are testing or what we seek to know) is whether the true mean blood lead level for male workers is GREATER THAN that of female workers. Next, we are using a 95% confidence interval. Now, the DIFFERENCE IN MEANS which is what we are measuring falls outside the confidence interval created. This means that the actual value of the difference in means is either less than the lower boundary value in our confidence interval OR higher than the upper boundary value in our confidence interval.
Answer:
Time taken to fill the pool = 7.81 hours
Step-by-step explanation:
We are given that it takes 19 seconds to fill 2 gallons. Therefore, we can use cross multiplication to know how long will it take to fill one gallon as follows :
Time taken to fill 2 gallons of tank = 19 seconds
Therefore, it takes 9.5 seconds to fill one gallon of water.
One gallon is equivalent to 0.133681 cubic feet
Therefore, it takes 9.5 seconds to fill 0.133681 cubic feet
Now, to find Volume of the pool :
radius of pool = 6 ft
volume of pool = pi × (radius)² × height
volume of pool = 3.14 × 6² × 3.5
volume of pool = 395.64 cubic feet
Time taken to fill 0.133681 cubic feet of water = 9.5 sec
Hence, Time taken to fill the pool = 7.81 hours
