A plane is in route to drop off much needed medical supplies to a town. At an altitude of 6.4 miles, it locates the town airport at an angle of depression of 7.9 degrees. How
many miles left does the plane need to travel? Round to the nearest tenth of a mile.

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the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

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the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0