Maths - General

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Author:
Anonymous
ID:
85888
Filename:
Maths - General
Updated:
2011-05-15 08:01:45
Tags:
igcse maths levels
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Description:
General maths
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  1. Which formula do you use when you know two sides and one angle?
    Cosine rule. a2 = b2 + c2 - (2bc Cos A)
  2. Which formula do you use when you know all three sides but no interior angles?
    Cosine Rule. Cos A = (b2 + c2 - a2)/2bc
  3. Which formula do you use when you have one angle and one side?
    SOH, CAH or TOA
  4. In inequalities, when does the direction sign change?
    When a side has been multiplied or divided by a negative number.
  5. What's the formula for simple interest?
    P x R x T/100 P = amount, R = rate, T = time (years).
  6. What is the formula for compound interest?
    (Percent + 100%)n x initial deposit. n = years
  7. What is the formula to find frequency density?
    frequency/class width

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