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Which formula do you use when you know two sides and one angle?
Cosine rule. a^{2} = b^{2} + c^{2 } (2bc Cos A)

Which formula do you use when you know all three sides but no interior angles?
Cosine Rule. Cos A = (b^{2} + c^{2}  a^{2})/2bc

Which formula do you use when you have one angle and one side?
SOH, CAH or TOA

In inequalities, when does the direction sign change?
When a side has been multiplied or divided by a negative number.

What's the formula for simple interest?
P x R x T/100 P = amount, R = rate, T = time (years).

What is the formula for compound interest?
(Percent + 100%)^{n} x initial deposit. n = years

What is the formula to find frequency density?
frequency/class width

