21ltilley
19.07.2020 •
Mathematics
Sheri's brother gave Sam his collection of stamps when she left for college. At that
time, the value of the collection was $420. Eight years later, the stamp collection
was worth $980. What is the rate of change?
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Ответ:
$70 per year.
Step-by-step explanation:
Let's say that x is the number of years that has passed and y is how much the stamp is worth.
So we know that in zero years the stamp was worth $420 because that is the time Sheri gave her brother Sam the stamp. That could bring up the coordinates (0,420) .
Now we know that in 8 years it was worth $980 and that could be the coordinates (8,980)
To find the rate of change we need to find the different between the y value and divide it by the difference in the x values.
420 - 980 = -560
0-8 = -8
-560/-8 = 70
The rate of change is 70 which means that it grew by $70 every year.
Ответ:
I think that it might be C. but I am NOT entirely sure though.
Step-by-step explanation: