Q. If f(x) = { x^2 + 1, x < 0; kx + 3, x = 0; 2x - 1, x > 0 is continuous at x = 0, find k.
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Solution
For continuity at x = 0, we need 1 = 3 and 1 = -1 + 3k, solving gives k = 1.
Correct Answer: C — 1
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Q. If f(x) = { x^2, x < 0; 2x + 3, x >= 0 }, find f(0).
A.
0
B.
3
C.
1
D.
undefined
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Solution
At x = 0, we use the second piece: f(0) = 2(0) + 3 = 3.
Correct Answer: B — 3
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Q. If f(x) = { x^2, x < 0; kx + 1, x >= 0 } is differentiable at x = 0, what is k?
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Solution
Setting the derivatives equal at x = 0 gives k = 0.
Correct Answer: B — 0
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Q. If f(x) = { x^2, x < 0; kx + 1, x = 0; 2x + 3, x > 0 is continuous at x = 0, find k.
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Solution
To ensure continuity at x = 0, we set k(0) + 1 = 0^2, leading to k = 2.
Correct Answer: C — 1
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Q. If f(x) = { x^2, x < 1; kx + 1, x >= 1 } is continuous at x = 1, find k.
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Solution
Setting the two pieces equal at x = 1 gives 1 = k + 1, hence k = 0.
Correct Answer: B — 1
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Q. If f(x) = { x^2, x < 2; 4, x = 2; 2x, x > 2 } is continuous at x = 2, what is the value of f(2)?
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Solution
For continuity at x = 2, f(2) must equal the limit from both sides, which is 4.
Correct Answer: B — 4
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Q. If f(x) = { x^2, x < 3; k, x = 3; 2x, x > 3 } is continuous at x = 3, what is the value of k?
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Solution
For continuity at x = 3, we need limit as x approaches 3 from left (9) to equal f(3) = k, thus k = 9.
Correct Answer: C — 6
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Q. If f(x) = { x^2, x < 3; k, x = 3; 3x - 2, x > 3 } is continuous at x = 3, what is k?
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Solution
For continuity at x = 3, we need k to equal the limit from both sides, which is 9.
Correct Answer: C — 8
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Q. If f(x) = |x - 2|, what is f(2)?
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Solution
f(2) = |2 - 2| = |0| = 0.
Correct Answer: A — 0
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Q. If f(x) = |x|, is f differentiable at x = 0?
A.
Yes
B.
No
C.
Only from the right
D.
Only from the left
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Solution
The left and right derivatives at x = 0 do not match, hence f is not differentiable at that point.
Correct Answer: B — No
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Q. If f(x) = |x|, what is f(-3)?
A.
-3
B.
3
C.
0
D.
undefined
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Solution
f(-3) = |-3| = 3.
Correct Answer: B — 3
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Q. If f(x) is continuous on [a, b], which of the following must be true?
A.
f(a) = f(b)
B.
f(x) takes every value between f(a) and f(b)
C.
f(x) is increasing
D.
f(x) is decreasing
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Solution
By the Intermediate Value Theorem, a continuous function on a closed interval takes every value between f(a) and f(b).
Correct Answer: B — f(x) takes every value between f(a) and f(b)
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Q. If f: A → B is a function and |A| = 5, |B| = 3, what is the maximum number of distinct functions f?
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Solution
The number of distinct functions from set A to set B is given by |B|^|A|. Here, |B| = 3 and |A| = 5, so the maximum number of distinct functions is 3^5 = 243.
Correct Answer: A — 3^5
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Q. If f: A → B is a function and |A| = 5, |B| = 3, what is the maximum number of distinct functions that can be formed?
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Solution
The maximum number of distinct functions is |B|^|A| = 3^5 = 243.
Correct Answer: A — 3^5
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Q. If G = (1, 0, 1) and H = (0, 1, 0), find G · H.
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Solution
G · H = 1*0 + 0*1 + 1*0 = 0 + 0 + 0 = 0.
Correct Answer: A — 0
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Q. If G = (1, 1, 1) and H = (1, -1, 1), what is G · H?
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Solution
G · H = 1*1 + 1*(-1) + 1*1 = 1 - 1 + 1 = 1.
Correct Answer: A — 0
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Q. If G = (1, 1, 1) and H = (2, 2, 2), what is G · H?
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Solution
G · H = 1*2 + 1*2 + 1*2 = 2 + 2 + 2 = 6.
Correct Answer: A — 3
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Q. If G = (2, 2) and H = (3, -1), what is G · H?
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Solution
G · H = 2*3 + 2*(-1) = 6 - 2 = 4.
Correct Answer: C — 5
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Q. If G = {1, 2, 3, 4, 5}, how many subsets have exactly 3 elements?
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Solution
The number of ways to choose 3 elements from 5 is given by the combination formula C(5, 3) = 10.
Correct Answer: A — 10
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Q. If G = {1, 2, 3, 4, 5}, what is the total number of subsets of G?
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Solution
The number of subsets of a set with n elements is 2^n. Here, n = 5, so 2^5 = 32.
Correct Answer: A — 32
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Q. If G = {1, 2, 3}, how many subsets contain the element '1'?
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Solution
The subsets containing '1' can be formed by including '1' and choosing from the remaining elements {2, 3}. There are 2^2 = 4 subsets, but we need to exclude the empty subset, so there are 4 - 1 = 3 subsets containing '1'.
Correct Answer: C — 6
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Q. If G = {1, 2, 3}, how many subsets of G have exactly 2 elements?
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Solution
The subsets with exactly 2 elements are {1, 2}, {1, 3}, and {2, 3}. So, there are 3 such subsets.
Correct Answer: C — 5
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Q. If G = {x, y, z}, how many subsets contain exactly 2 elements?
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Solution
The subsets containing exactly 2 elements are {x, y}, {x, z}, and {y, z}. So, there are 3 such subsets.
Correct Answer: A — 3
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Q. If G = {x, y}, what is the number of subsets of G?
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Solution
The number of subsets of a set with n elements is 2^n. Here, n=2, so the number of subsets is 2^2 = 4.
Correct Answer: C — 4
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Q. If g(x) = 3x + 2, what is g(-1)?
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Solution
g(-1) = 3(-1) + 2 = -3 + 2 = -1.
Correct Answer: A — -1
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Q. If H = {1, 2, 3}, how many subsets of H have exactly 2 elements?
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Solution
The number of ways to choose 2 elements from 3 is given by the combination formula C(3, 2) = 3.
Correct Answer: B — 6
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Q. If H = {x, y, z}, how many subsets of H have at least one element?
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Solution
The total number of subsets is 2^3 = 8. Subtracting the empty set gives 8 - 1 = 7.
Correct Answer: A — 7
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Q. If H = {x, y}, how many subsets of H are also subsets of the power set of H?
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Solution
The power set of H is {∅, {x}, {y}, {x, y}}. The subsets of H are {∅, {x}, {y}}.
Correct Answer: C — 4
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Q. If h(x) = x^3 - 3x + 2, what is the critical point?
A.
x = 0
B.
x = 1
C.
x = -1
D.
x = 2
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Solution
h'(x) = 3x^2 - 3 = 0 gives x^2 = 1, so x = 1 and x = -1 are critical points.
Correct Answer: B — x = 1
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Q. If h(x) = x^3 - 3x + 2, what is the value of h(1)?
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Solution
h(1) = 1^3 - 3(1) + 2 = 1 - 3 + 2 = 0.
Correct Answer: A — 0
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