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jayloy969
04.05.2020 •
Mathematics
Need help on both of these Calculus AB mock exams.
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Ответ:
AB1
(a)
is continuous at
if the two-sided limit exists. By definition of
, we have
. We need to have
, since continuity means
By the fundamental theorem of calculus (FTC), we have
We know
, and the graph tells us the *signed* area under the curve from 4 to 6 is -3. So we have
and hence
is continuous at
.
(b) Judging by the graph of
, we know
has local extrema when
. In particular, there is a local maximum when
, and from part (a) we know
.
For
, we see that
, meaning
is strictly non-decreasing on (6, 10). By the FTC, we find
which is larger than -1, so
attains an absolute maximum at the point (10, 7).
(c) Directly substituting
into
yields
From the graph of
, we know the value of the integral is -3 + 7 = 4, so the numerator reduces to 0. In order to apply L'Hopital's rule, we need to have the denominator also reduce to 0. This happens if
Next, applying L'Hopital's rule to the limit gives
which follows from the fact that
and
.
Then using the value of
we found earlier, we end up with
(d) Differentiate both sides of the given differential equation to get
The concavity of the graph of
at the point (1, 2) is determined by the sign of the second derivative. For
, we have
, so the sign is entirely determined by
.
When
, this is equal to
We know
, since
has a horizontal tangent at
, and from the graph of
we also know
. So we find
, which means
is concave upward at the point (1, 2).
(e)
is increasing when
. The sign of
is determined by
. We're interested in the interval
, and the behavior of
on this interval depends on the behavior of
on
.
From the graph, we know
on (0, 4), (6, 9), and (9, 10). This means
on (0, 2), (3, 4.5), and (4.5, 5).
(f) Separating variables yields
Integrating both sides gives
Ответ:
make me x
Step-by-step explanation: