An engineer needs to determine the amount of stone to order for a road construction project. The table shows the amount of stone
needed for each meter of highway, estimate the amount of each type of stone needed for a 290 meter section of the road, Estimate each value to the nearest 1000 tons.
2 answers:
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Answer:
-3
Step-by-step explanation:
means
What is the -coordinate value that corresponds to
. That value is -1.
What is the -coordinate value that corresponds to
. That value is 0.
So this implies .
Answer:
(a) As time increases, the amount of water in the pool increases.
11 gallons per minute
(b) 65 gallons
Step-by-step explanation:
From inspection of the table, we can see that <u>as time increases, the amount of water in the pool increases</u>.
We are told that Ann adds water at a constant rate. Therefore, this can be modeled as a linear function.
The rate at which the water is increasing is the <em>rate of change</em> (which is also the <em>slope </em>of a linear function).
Choose 2 ordered pairs from the table:
Input these into the slope formula:
Therefore, the rate at which the water in the pool is increasing is:
<u>11 gallons per minute</u>
To find the amount of water that was already in the pool when Ann started adding water, we need to create a linear equation using the found slope and one of the ordered pairs with the point-slope formula:
When Ann had added no water, x = 0. Therefore,
So there was <u>65 gallons</u> of water in the pool before Ann starting adding water.