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To find a part of the area we need the whole area first.Find the formula for the area of a circle: A= pi x r2We have been given the diameter so we need to work out what the radius ...
the nth term formula is the sum of the first term (a) and the second to last term (n-1) * the common difference (d). so a + (n-1)d where a = 2 and d = 4 in this case is 2 + (n-1)4 = 4n - 2. the sum to...
Analyse the sequence to find the second order difference.10 13 20 31 46 75 3 7 11 15 19 4 4 4 4
Subsitute y for 5 to give 9x - (3 * 5) = 97 - 5xCalculate the brackets 9x - 15 = 97 - 5xAdd 15 to both sides 9x = 112 - 5xAdd 5x to both sides 14x = 112Divide both sides by 14 x = 8
First, you regroup all numbers which are not factors of x on one side of the equation: 4x = 1 - 3.5so 4x = - 2.5Then, you isolate x: x = - 2.5/4x = - 5/8 = - 0.625
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