Algebra
Solve: 3x – 9 = 6
x = 5
Factor x² + 3x + 2
(x + 1)(x + 2)
SOH-CAH-TOA means what?
Sine = opp/hyp, Cosine = adj/hyp, Tangent = opp/adj.
What’s 20% of 60?
12
Distance formula?
√((x₂ – x₁)² + (y₂ – y₁)²)
Slope of a line through (2,4) and (6,8)?
m = 1
Solve x² = 25
x = ±5
Find area of a circle with r = 3. (Exact Form)
9π
A bag has 3 red, 2 blue — P(red)?
3/5 or 0.6
Slope formula?
(y₂ – y₁)/(x₂ – x₁)
Solve for x: 2x + 5 = 17
x= 6
What’s the vertex of y = (x – 3)² + 2?
(3, 2)
What’s the volume of a cone with r = 3, h = 6?
(Approximate)
56.52 (≈)
What’s the ratio of 2:3 simplified?
It is already simplified.
Area of a cylinder?
2πr² + 2πrh
What’s the y-intercept in y = 4x – 2?
-2
When is a parabola upside-down?
When the coefficient of x² is negative.
How many degrees in a triangle?
180°
Median of 4, 7, 8, 10, 12?
8
Volume of a sphere?
(4/3)πr³
Explain why you flip an inequality sign.
When multiplying/dividing by a negative number, flip the inequality.
Solve system: y = 2x + 1 and y = –x + 4.
(1,3)
Find the missing side: sin(θ)=3/5, hyp=10.
Opposite side = 6.
Line graph slopes upward — positive or negative?
Positive
Equation of a line through (1,2) slope 3?
y – 2 = 3(x – 1) → y = 3x – 1