Math Flashcards
7 cards from real CLT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Math flashcards as text
What is the domain of f(x) = √(x - 3)?
Answer: x ≥ 3
The radicand must be non-negative: x - 3 ≥ 0, so x ≥ 3.
The graph of y = -2x² + 4 opens in which direction and has its vertex at:
Answer: Downward; (0, 4)
The negative leading coefficient means it opens downward, and the vertex is at (0, 4).
Simplify: (x³ · x⁵) / x⁴
Answer: x⁴
x³ · x⁵ = x⁸; x⁸ / x⁴ = x⁴.
If log₂(x) = 5, what is x?
Answer: 32
log₂(x) = 5 means 2⁵ = x, so x = 32.
Which equation represents a line perpendicular to y = 3x - 2?
Answer: y = -(1/3)x + 7
Perpendicular slopes are negative reciprocals; the reciprocal of 3 is -1/3.
A function is defined as g(x) = (x + 2)/(x - 1). For which value of x is g(x) undefined?
Answer: x = 1
The function is undefined when the denominator equals zero: x - 1 = 0, so x = 1.
The arithmetic mean of five numbers is 14. If four of the numbers are 10, 12, 16, and 18, what is the fifth?
Answer: 14
Total sum = 5 × 14 = 70; fifth number = 70 - (10 + 12 + 16 + 18) = 70 - 56 = 14.