Q. What is the intersection of the sets A = {1, 2, 3} and B = {2, 3, 4}?
A.
{1, 2, 3}
B.
{2, 3}
C.
{4}
D.
{1, 4}
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Solution
The intersection of two sets includes only the elements that are present in both sets. Here, the intersection is {2, 3}.
Correct Answer: B — {2, 3}
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Q. What is the inverse of the function f(x) = 2x + 3?
A.
(x - 3)/2
B.
(x + 3)/2
C.
2x - 3
D.
2(x - 3)
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Solution
To find the inverse, set y = 2x + 3, solve for x: x = (y - 3)/2.
Correct Answer: A — (x - 3)/2
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Q. What is the inverse of the function f(x) = 2x + 5?
A.
f^-1(x) = (x - 5)/2
B.
f^-1(x) = 2x - 5
C.
f^-1(x) = (x + 5)/2
D.
f^-1(x) = 5 - 2x
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Solution
To find the inverse, set y = 2x + 5, solve for x: x = (y - 5)/2, thus f^-1(x) = (x - 5)/2.
Correct Answer: A — f^-1(x) = (x - 5)/2
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Q. What is the inverse of the function f(x) = 3x + 1?
A.
(x-1)/3
B.
(x-1)/3
C.
(x-3)/1
D.
3(x-1)
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Solution
To find the inverse, set y = 3x + 1, solve for x: x = (y - 1)/3.
Correct Answer: A — (x-1)/3
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Q. What is the inverse of the function f(x) = 3x + 4?
A.
(x - 4)/3
B.
(x + 4)/3
C.
3/x - 4
D.
3/x + 4
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Solution
To find the inverse, set y = 3x + 4, solve for x: x = (y - 4)/3, hence the inverse is (x - 4)/3.
Correct Answer: A — (x - 4)/3
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Q. What is the inverse of the function f(x) = 3x - 5?
A.
(x + 5)/3
B.
(x - 5)/3
C.
3(x + 5)
D.
3(x - 5)
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Solution
To find the inverse, set y = 3x - 5, solve for x: x = (y + 5)/3, hence f^(-1)(x) = (x + 5)/3.
Correct Answer: A — (x + 5)/3
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Q. What is the inverse of the matrix A = [[0, 1], [1, 0]]?
A.
[[0, 1], [1, 0]]
B.
[[1, 0], [0, 1]]
C.
[[0, 0], [0, 0]]
D.
[[1, 1], [1, 1]]
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Solution
The inverse of A is A itself since A is an involutory matrix.
Correct Answer: A — [[0, 1], [1, 0]]
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Q. What is the inverse of the matrix A = [[1, 2], [3, 4]]?
A.
[[4, -2], [-3, 1]]
B.
[[-2, 1], [1.5, -0.5]]
C.
[[-2, 1], [1.5, -0.5]]
D.
[[2, -1], [-1.5, 0.5]]
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Solution
The inverse of A is (1/det(A)) * adj(A) = (1/-2) * [[4, -2], [-3, 1]] = [[-2, 1], [1.5, -0.5]].
Correct Answer: A — [[4, -2], [-3, 1]]
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Q. What is the length of the altitude from vertex A to side BC in triangle ABC with sides 5 cm, 12 cm, and 13 cm?
A.
5 cm
B.
6 cm
C.
12 cm
D.
13 cm
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Solution
The area of the triangle can be calculated as (1/2) * base * height. The area is 30 cm² (since it's a right triangle). Using area = (1/2) * 12 * height, we find height = 5 cm.
Correct Answer: B — 6 cm
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Q. What is the length of the altitude from vertex A to side BC in triangle ABC with sides AB = 6, AC = 8, and BC = 10?
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Solution
Using the area formula, Area = 1/2 * base * height. The area can also be calculated using Heron's formula, which gives 24. Thus, height = (2 * Area) / base = (2 * 24) / 10 = 4.8.
Correct Answer: A — 4.8
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Q. What is the length of the altitude from vertex A to side BC in triangle ABC with sides a = 6, b = 8, and c = 10?
A.
4.8
B.
5.4
C.
6.0
D.
7.2
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Solution
Using the area formula, Area = 1/2 * base * height. First, find the area using Heron's formula, then use it to find the height.
Correct Answer: A — 4.8
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Q. What is the length of the diagonal of a rectangle with vertices at (0, 0), (0, 4), (3, 0), and (3, 4)?
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Solution
Diagonal length = √[(3-0)² + (4-0)²] = √[9 + 16] = √25 = 5.
Correct Answer: C — 5
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Q. What is the length of the diameter of a circle with radius 7?
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Solution
The diameter is twice the radius, so 2 * 7 = 14.
Correct Answer: B — 14
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Q. What is the length of the diameter of a circle with the equation (x - 1)² + (y + 2)² = 16?
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Solution
The radius is √16 = 4, so the diameter is 2 * radius = 8.
Correct Answer: B — 8
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Q. What is the length of the latus rectum of the ellipse x^2/36 + y^2/16 = 1?
A.
8/3
B.
12
C.
16/3
D.
24
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Solution
The length of the latus rectum is given by (2b^2/a). Here, b^2 = 16, a^2 = 36, so length = (2*16/6) = 12.
Correct Answer: B — 12
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Q. What is the length of the latus rectum of the ellipse x^2/a^2 + y^2/b^2 = 1?
A.
2b^2/a
B.
2a^2/b
C.
2a
D.
2b
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Solution
The length of the latus rectum of the ellipse is given by 2a^2/b.
Correct Answer: B — 2a^2/b
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Q. What is the length of the latus rectum of the parabola y^2 = 12x?
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Solution
The length of the latus rectum of a parabola given by the equation y^2 = 4px is 4p. Here, 4p = 12, so p = 3. Therefore, the length of the latus rectum is 4p = 12.
Correct Answer: B — 6
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Q. What is the length of the latus rectum of the parabola y^2 = 4ax?
A.
2a
B.
4a
C.
a
D.
None of the above
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Solution
The length of the latus rectum of the parabola y^2 = 4ax is 4a.
Correct Answer: A — 2a
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Q. What is the length of the latus rectum of the parabola y^2 = 8x?
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Solution
The length of the latus rectum of the parabola y^2 = 8x is 4.
Correct Answer: A — 4
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Q. What is the length of the line segment joining the points (-1, -1) and (2, 3)?
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Solution
Length = √[(2 - (-1))² + (3 - (-1))²] = √[3² + 4²] = √25 = 5.
Correct Answer: C — 5
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Q. What is the length of the line segment joining the points (1, 2) and (1, 5)?
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Solution
Length = |5 - 2| = 3.
Correct Answer: A — 3
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Q. What is the length of the median from vertex A to side BC in triangle ABC with sides a = 6, b = 8, c = 10?
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Solution
Median length m_a = 1/2 * √(2b^2 + 2c^2 - a^2) = 1/2 * √(2*8^2 + 2*10^2 - 6^2) = 1/2 * √(128 + 200 - 36) = 1/2 * √292 = 7.
Correct Answer: C — 7
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Q. What is the length of the segment of the line 3x + 4y = 12 between the x-axis and y-axis?
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Solution
The x-intercept is (4, 0) and the y-intercept is (0, 3). The length of the segment is sqrt((4-0)^2 + (0-3)^2) = sqrt(16 + 9) = 5.
Correct Answer: B — 6
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Q. What is the limit of (1/x) as x approaches infinity?
A.
0
B.
1
C.
Infinity
D.
-Infinity
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Solution
As x approaches infinity, (1/x) approaches 0.
Correct Answer: A — 0
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Q. What is the limit of (x^2 - 1)/(x - 1) as x approaches 1?
A.
0
B.
1
C.
2
D.
Infinity
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Solution
Using L'Hôpital's Rule, lim (x -> 1) (x^2 - 1)/(x - 1) = lim (x -> 1) (2x)/(1) = 2.
Correct Answer: C — 2
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Q. What is the limit of f(x) = 1/x as x approaches 0 from the right?
A.
0
B.
Infinity
C.
1
D.
Does not exist
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Solution
As x approaches 0 from the right, f(x) approaches infinity, indicating a discontinuity at x = 0.
Correct Answer: B — Infinity
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Q. What is the magnitude of the vector (2, -3, 6)?
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Solution
Magnitude = √(2^2 + (-3)^2 + 6^2) = √(4 + 9 + 36) = √49 = 7.
Correct Answer: B — 9
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Q. What is the magnitude of the vector (3, 4)?
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Solution
Magnitude = √(3^2 + 4^2) = √(9 + 16) = √25 = 5
Correct Answer: A — 5
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Q. What is the magnitude of the vector C = (6, 8, 10)?
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Solution
Magnitude |C| = √(6^2 + 8^2 + 10^2) = √(36 + 64 + 100) = √200 = 10√2.
Correct Answer: C — 14
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Q. What is the magnitude of the vector v = (3, -4)?
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Solution
Magnitude of v = √(3^2 + (-4)^2) = √(9 + 16) = √25 = 5.
Correct Answer: A — 5
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