<span>Find a percent of a quantity as a rate per 100 (e.g., 30% of a quantity means 30/100 times the quantity); solve problems involving finding the whole, given a part and the percent. Use ratio reasoning to convert measurement units; manipulate and transform units appropriately when multiplying or dividing quantities.
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Rate of change is also another name for the slope so in this case, the question is asking you for the slope.
How can we find the slope?
The formula for slope is y2-y1/x2-x1
Now let's plug in for the year 1980 and 1990.
239-120/1990-1980
= 119/10
Slope is 119/10.
Answer:
add them up
Step-by-step explanation:
