Question 1 of 5 Following a volcanic eruption, which event is usually the last one to be
observed?
A. Grasses begin to grow in soil with organic matter
B. Lichens begin to cover bare rock.
C. Mosses begin to grow in thin, rocky soil.
D. Trees begin to grow in thick, rich soil.

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Explanation:

The answer is=>A. Grasses begin to grow in soil with organic matter.

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a. the production of carbon dioxide through the process of photosynthesis

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.