Q. If the equation 2x + 3y = 6 is transformed into slope-intercept form, what is the slope of the line?
A.
-2
B.
2
C.
-3/2
D.
3/2
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Solution
Rearranging the equation to y = -2/3x + 2 shows that the slope is -2/3.
Correct Answer: C — -3/2
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Q. If the equation of a line is given as 2x - 3y + 6 = 0, what is the y-intercept of the line?
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Solution
To find the y-intercept, set x = 0. The equation becomes -3y + 6 = 0, leading to y = 2.
Correct Answer: B — 2
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Q. If the equation of a line is given as y = mx + b, what does 'm' represent?
A.
The y-intercept
B.
The x-intercept
C.
The slope of the line
D.
The constant term
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Solution
'm' represents the slope of the line in the slope-intercept form of a linear equation.
Correct Answer: C — The slope of the line
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Q. If the equation of a line is y = -1/2x + 3, what is the x-intercept?
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Solution
To find the x-intercept, set y = 0. The equation becomes 0 = -1/2x + 3, leading to x = 6.
Correct Answer: A — 6
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Q. If the equation of a line is y = -1/2x + 3, what is the y-value when x = 4?
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Solution
Substituting x = 4 into the equation gives y = -1/2(4) + 3 = -2 + 3 = 1.
Correct Answer: B — 2
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Q. If the equation of a line is y = mx + c, what does 'm' represent?
A.
The y-intercept
B.
The slope
C.
The x-intercept
D.
The distance
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Solution
'm' in the equation of a line represents the slope, which indicates the steepness and direction of the line.
Correct Answer: B — The slope
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Q. If the expansion of (x + y)^n contains a term with x^4y^2, what can be inferred about the value of n?
A.
n must be 6.
B.
n must be greater than 6.
C.
n must be less than 6.
D.
n can be any integer.
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Solution
In the term x^4y^2, the sum of the exponents (4 + 2) must equal n, hence n = 6.
Correct Answer: A — n must be 6.
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Q. If the expansion of (x + y)^n contains a term with x^4y^3, what can be inferred about n?
A.
n must be 7.
B.
n must be greater than 7.
C.
n must be less than 7.
D.
n can be any integer.
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Solution
The sum of the exponents in the term x^4y^3 is 4 + 3 = 7, hence n must be 7.
Correct Answer: A — n must be 7.
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Q. If the exterior angle of a regular polygon is 30 degrees, how many sides does it have?
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Solution
The sum of the exterior angles of any polygon is 360 degrees. Therefore, the number of sides can be calculated as 360 / 30 = 12.
Correct Answer: B — 12
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Q. If the first term of a geometric progression is x and the common ratio is 1/2, what is the sum of the first 5 terms?
A.
x
B.
x/2
C.
x/3
D.
x(1 - (1/2)^5)/(1 - 1/2)
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Solution
The sum of the first n terms of a GP is given by S_n = a(1 - r^n) / (1 - r). Here, S_5 = x(1 - (1/2)^5) / (1 - 1/2) = x(1 - 1/32) / (1/2) = x(31/32) * 2 = x(62/32).
Correct Answer: D — x(1 - (1/2)^5)/(1 - 1/2)
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Q. If the first term of a GP is 4 and the common ratio is 3, what is the product of the first three terms?
A.
144
B.
108
C.
81
D.
64
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Solution
The first three terms are 4, 12, and 36. Their product = 4 * 12 * 36 = 1728.
Correct Answer: A — 144
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Q. If the first term of a GP is 7 and the common ratio is 3, what is the 6th term?
A.
567
B.
729
C.
243
D.
81
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Solution
The 6th term is given by 7 * 3^(6-1) = 7 * 243 = 1701.
Correct Answer: B — 729
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Q. If the first term of a GP is x and the common ratio is y, which of the following represents the 4th term?
A.
xy^3
B.
x^3y
C.
x^4y
D.
xy^4
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Solution
The nth term of a GP is given by a * r^(n-1). Thus, the 4th term is x * y^(4-1) = xy^3.
Correct Answer: A — xy^3
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Q. If the first term of a harmonic progression is 1 and the common difference of the corresponding arithmetic progression is 2, what is the second term of the harmonic progression?
A.
1/2
B.
1/3
C.
1/4
D.
1/5
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Solution
The first term is 1, and the second term's reciprocal will be 1 + 2 = 3. Therefore, the second term is 1/3.
Correct Answer: A — 1/2
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Q. If the first term of a harmonic progression is 1 and the second term is 1/3, what is the third term?
A.
1/2
B.
1/4
C.
1/6
D.
1/8
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Solution
The reciprocals of the terms are 1, 3, and 1/x. The common difference is 2, so 1/x = 3 + 2 = 5, thus x = 1/5.
Correct Answer: C — 1/6
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Q. If the first term of a harmonic progression is 4 and the common difference of the corresponding arithmetic progression is 2, what is the second term?
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Solution
The first term is 4, and the reciprocal is 1/4. The second term's reciprocal will be 1/4 + 2 = 9/4, so the second term is 4/9.
Correct Answer: D — 5
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Q. If the first term of a harmonic progression is 5 and the common difference of the corresponding arithmetic progression is 2, what is the second term?
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Solution
The first term in the arithmetic progression is 1/5, and the common difference is 2. Therefore, the second term in the harmonic progression is 1/(1/5 + 2) = 1/(2.2) = 5/11.
Correct Answer: D — 6
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Q. If the first term of a harmonic progression is 5 and the second term is 10, what is the fourth term?
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Solution
The reciprocals are 1/5 and 1/10. The common difference is -1/10. The fourth term's reciprocal will be 1/10 - 1/10 = 1/25, hence the fourth term is 25.
Correct Answer: C — 25
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Q. If the first term of a harmonic progression is 5 and the second term is 10, what is the third term?
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Solution
The reciprocals are 1/5 and 1/10. The common difference is -1/10. The third term's reciprocal will be 1/10 - 1/10 = 1/15, so the third term is 15.
Correct Answer: C — 25
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Q. If the first term of a series is 10 and the last term is 50 with a common difference of 5, how many terms are in the series? (2023)
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Solution
The number of terms n can be calculated using the formula: n = (last - first) / difference + 1. Here, n = (50 - 10) / 5 + 1 = 9.
Correct Answer: B — 9
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Q. If the first term of an arithmetic progression is 12 and the last term is 48, with a total of 10 terms, what is the common difference?
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Solution
The last term can be expressed as a + (n-1)d. Here, 48 = 12 + 9d. Solving gives d = 4.
Correct Answer: A — 4
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Q. If the first term of an arithmetic progression is 7 and the common difference is -2, what is the 8th term?
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Solution
Using the formula for the nth term, a + (n-1)d = 7 + (8-1)(-2) = 7 - 14 = -7.
Correct Answer: A — -1
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Q. If the first term of an arithmetic progression is 7 and the last term is 37, with a total of 16 terms, what is the common difference?
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Solution
Using the formula for the last term, l = a + (n-1)d, we have 37 = 7 + (16-1)d. Solving gives d = 2.
Correct Answer: A — 2
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Q. If the first term of an arithmetic sequence is 5 and the common difference is 3, what is the 10th term? (2023)
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Solution
The nth term of an arithmetic sequence is given by a + (n-1)d. Here, a = 5, d = 3, n = 10. So, 5 + (10-1)3 = 32.
Correct Answer: A — 32
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Q. If the first three terms of a harmonic progression are 1, 1/2, and 1/3, what is the common difference of the corresponding arithmetic progression?
A.
1/6
B.
1/3
C.
1/2
D.
1
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Solution
The reciprocals are 1, 2, and 3. The common difference is 2 - 1 = 1.
Correct Answer: A — 1/6
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Q. If the first three terms of a harmonic progression are 1, 1/2, and 1/3, what is the fourth term?
A.
1/4
B.
1/5
C.
1/6
D.
1/7
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Solution
The reciprocals are 1, 2, and 3, which are in arithmetic progression. The next term in the sequence of reciprocals is 4, so the fourth term is 1/4.
Correct Answer: C — 1/6
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Q. If the first three terms of a harmonic progression are a, b, and c, which of the following equations holds true?
A.
1/a + 1/b = 1/c
B.
1/a + 1/c = 1/b
C.
1/b + 1/c = 1/a
D.
1/a + 1/b + 1/c = 0
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Solution
In a harmonic progression, the reciprocals of the terms form an arithmetic progression, hence 1/a + 1/b = 1/c.
Correct Answer: A — 1/a + 1/b = 1/c
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Q. If the first three terms of a harmonic progression are a, b, c, which of the following is true?
A.
1/a, 1/b, 1/c are in AP
B.
a, b, c are in AP
C.
1/a, 1/b, 1/c are in GP
D.
b = (a+c)/2
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Solution
In a harmonic progression, the reciprocals of the terms are in arithmetic progression, hence 1/a, 1/b, 1/c are in AP.
Correct Answer: A — 1/a, 1/b, 1/c are in AP
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Q. If the GCD of two numbers is 1, which of the following statements is true?
A.
The numbers are multiples of each other
B.
The numbers are co-prime
C.
The numbers are both even
D.
The numbers are both odd
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Solution
If the GCD of two numbers is 1, it means they have no common factors other than 1, hence they are co-prime.
Correct Answer: B — The numbers are co-prime
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Q. If the graph of a function f(x) is symmetric about the y-axis, which of the following must be true?
A.
f(x) = f(-x) for all x.
B.
f(x) = -f(-x) for all x.
C.
f(x) is always positive.
D.
f(x) has a maximum value.
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Solution
A function that is symmetric about the y-axis satisfies the property f(x) = f(-x) for all x.
Correct Answer: A — f(x) = f(-x) for all x.
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