# ACT prep math flashcards

## 54 terms

### Rules of exponents

Rule #1: To multiply identical bases, add the exponents
Rule #2: To divide identical bases, subtract the exponents
Rule #3: When there are two or more exponents and only one base, multiply the exponents.

### Foil

"First outside inside out"

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### Solve linear equations

Set the equations equal to each other

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### Self check: Plug the number back in after solving

Radical equations are equations with any root whether a square root, a cube root or any other.

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### Arithmetic sequence

Sequence of numbers that follow a pattern

Plug a,b,c into the quadratic formula

Adds to the middle number and multiplies to the last number

### Inequalities: -3x-1<5

Solve like regular equation just flip the sign if you divide by a negative number.

### Matrices

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They have to be the same size and then you add the numbers together that are in the same row and column as it.

### Matrix multiplication

You can only multiply two matrices if the number of columns in the first equals the number of rows in the second. Then to figure out the dimensions its the number of rows in the first and then the number of columns in the second.

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y=mx+b

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### x-intercept

Plug 0 in for y and solve

### Y-intercept

Plug 0 in for x and solve

### How do you know if 2 lines are perpendicular?

The slopes are reciprocals of each other and the opposite sign.

If a>0 the parabola opens upward
If a<0 then the parabola opens downward
C is the y-intercept

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### Supplementary Angles

Two angles are supplementary if they add up to 180 degrees

### Complementary Angles

Two angles are complementary if they add up to 90 degrees

### Parallel Lines

Two lines that go on forever and never tough or cross

### Calculate the value of an exterior angle

Always adds up to 180 degrees so you just subtract the interior angle by 180 degrees to get the exterior angle measure.

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### Equilateral triangles

All the side lengths are the same length

### Isosceles triangles

Two of the side lengths are the same length

### Similar triangles

They are similar meaning they have the same angle measures and the corresponding sides are proportional
a/d=b/e=c/f

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### Regular polygon

All angles and sides are equal

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