August 2026 Corrections - Math ACT

1/2bh

Area of a triangle formula

y = mx + b

Slope-intercept form, very important to get equations in this form for certain questions

Algebra

Don’t forget to use _____________ and assign variables to unknowns

Rational Numbers

These numbers can be rewritten as fractions with an integer in the numerator and denominator.

Irrational numbers

Includes pi, e, and non-perfect square roots.

0, 1

y=sinx starts at _____, y=cosx starts at _____

Amplitude

Distance from center line to peak, in y=sinx it is 1

a2 + b2 = c2

Pythagorean theorem

Separately

When looking for patterns, look at each element ___________ (e.g. numerators first, then denominators, then whole fraction)

adding, multiplying

Arithmetic series is ____________, geometric series is ___________

Common ratio

What is being added/multiplied in an arithmetic/geometric series

Write out all possibilities

Probability = hit/total, don’t forget that you can ______________

Anything

What can be plugged into a function?

None

Parallel lines mean how many solutions?

One

Perpendicular lines mean how many solutions?

Infinite

Identical lines mean how many solutions?

The same

Parallel lines have _______ slopes. Identical lines have _________ slopes.

Opposite reciprocal.

Perpendicular lines have _____________ slopes.