The independent variable is the day of the year. The function is the cumulative number of accidents since the first of the year
1 answer:
Answer:
The units of the average growth rate is number of accidents per day.
Step-by-step explanation:
We are given the following in the question:
The independent variable is the day of the year.
The function is the cumulative number of accidents since the first of the year at a certain dangerous intersection.
Average growth represents the rate at which the dependent variable changes as the independent variable changes.
Independent variable: day of the year
Dependent variable: cumulative number of accidents
Thus, the growth rate will have units
Thus, the units of the average growth rate is number of accidents per day.
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Graph and equation both shows the proportional comparison between two quantities
for example, equation y = 4x, this means, the value of 'y' will always be 4 times the value of 'x'
More complex equation such as y = 3x + 5, means that the value of 'y' equals to 5 more triples of value of 'x'
Another example is the conversion graph attached below, it shows the relationship between kilometers and miles. For example, we want to find out how many miles are in 10 kilometers, we would draw a line from the point that shows 10 km towards the graph, then across from the graph to miles, and we'd get a reading of 12 miles.
for example, equation y = 4x, this means, the value of 'y' will always be 4 times the value of 'x'
More complex equation such as y = 3x + 5, means that the value of 'y' equals to 5 more triples of value of 'x'
Another example is the conversion graph attached below, it shows the relationship between kilometers and miles. For example, we want to find out how many miles are in 10 kilometers, we would draw a line from the point that shows 10 km towards the graph, then across from the graph to miles, and we'd get a reading of 12 miles.
Answer: Choice B) between 6:48 AM and 5:12 PM
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Explanation:
I've seen this problem before, and the first part states that if the temperature is above 25 degrees C, then the air conditioner turns on to start cooling the castle.
We want to find values of t that satisfy f(t) > 25
This is the same as trying to solve f(t) - 25 > 0
So we have,
To solve this inequality, we can graph using Desmos as I've done so below. See the attached image.
Note how I used x in place of t. This is because the graphing calculator graphs (x,y) coordinates.
Furthermore, note how I marked the two points (6.769, 0) and (17.231, 0)
Between these two points is when the curve is above the x axis, when f(t) > 25 is true. This is when the temperature is above 25 degrees C, and when the air conditioner is working.
When t = 6.769, this means that roughly 6.769 hours have passed since midnight which means we're somewhere between 6 am and 7 am. The only value that works from the answer choices is 6:48 AM.
Note how 0.769*60 = 46.14 is fairly close to 48. This error is likely due to how things are rounded.
Then focusing on the point (17.231, 0) means that t = 17.231. So 17.231 hours have elapsed since midnight and we're now at roughly 1700 hours
1700 hours in military time = 17-12 = 5 pm
The time value t = 17.231 is between 5 pm and 6 pm. The only thing that works is 5:12 pm.
We can then note how 0.231*60 = 13.86 which is also probably due to rounding error (it's fairly close to 12 though).
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In short, we found the function for f(t)-25 and graphed it as shown below. The two points (6.769, 0) and (17.231, 0) help us see when the AC is turned on, which is roughly between 6:48 AM and 5:12 PM. This seems like a reasonable time for the AC to be operational. Something like between 5:12 PM and 6:48 AM seems like a bad idea because the AC would be working mostly at night, instead of during the day.
Anything beyond t = 24 represents the next day, which is when the cycle starts all over again. So we only need to focus on the window from t = 0 to t = 24. Specifically, the portion of the f(t)-25 curve that is above the x axis.
