Hey guys! I'm a little bit stressed about the ACT. I want to do my best on the math portion but feel like I'm missing crucial formulas that'll come in handy. Can anyone provide a list of essential math formulas or concepts I should have memorized for the ACT? Thanks in advance!
Hey there! It's completely normal to feel a little stressed about standardized tests like the ACT. But don't worry, I got you covered with some essential math formulas and concepts to have in your arsenal for the ACT Math section.
1. Quadratic Formula: x = (-b ± √(b²-4ac))/2a
This formula is crucial for solving quadratic equations that cannot be factored easily.
2. Distance Formula: d=√((x₂-x₁)²+(y₂-y₁)²)
This is used to find the distance between two points in a plane.
3. Slope-Intercept Formula for a Linear Equation: y = mx+b
Helpful for identifying the slope (m) and y-intercept (b) of a line given the equation.
4. Pythagorean Theorem: a² + b² = c²
Used for solving right triangles, where a and b are the legs and c is the hypotenuse.
5. Simple Interest Formula: I = prt
This calculates the interest (I) earned from an investment with principal (p), rate (r), and time (t).
6. Area and Circumference of a Circle: A = πr², C = 2πr
Helps find the area (A) and circumference (C) of a circle with given radius (r).
7. Perimeter and Area of a Rectangle: P = 2l+2w, A = lw
Used for calculating the perimeter (P) and area (A) of a rectangle with length (l) and width (w).
These are just a few key formulas and concepts, but having them in your arsenal should help you tackle a good chunk of the math problems on the ACT!
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