How many seconds of film is in 120 minutes of video?
2 answers:
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Answer:
The number of hot beverages = 45 and number of cold beverages = 180
Step-by-step explanation:
We have to write the equation of hot and cold beverages and find how many of each were sold.
Cost of cold beverage = $1.50
Cost of hot beverage = $2.00
The total cost of beverages on that day totaled to be $360.
We are also told that the number of cold beverages sold is 4 times as many hot beverages.
Let number of hot beverages = x
Cold beverages = 4x
Total cost = $360
= 360
8x = 360
x =
x = 45
The number of hot beverages = 45 and number of cold beverages = 180
Answer:
7. $8123.79
8. 0.012 g
Step-by-step explanation:
It often pays to follow directions. The attachment shows the use of a TI-84 graphing calculator to find the answers.
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You will notice that the answer to problem 8 does not agree with any of the offered choices. The time period of 22.8 years is 12 times the half-life of the substance, so there will be (1/2)^12 = 1/4096 of the original amount remaining. The time periods corresponding to the amounts shown range from 1.37 years to 16.4 years.
For half-life problems, I find it convenient to use the decay factor (0.5^(1/half-life)) directly, rather than convert it to e^-k. If you do convert it to the form ...
e^(-kt)
the value of k is (ln(2)/half-life), about 0.3648143056.
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For multiple choice problems where the choices make no sense, I like to suggest you ask your teacher to show you how to work the problem. (Alternatively, use the "Report this question" or "Ask a tutor" button sometimes provided.)
