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The area under a curve is found by integration.Area = integral{xexp(x) dx} with limits 0 and 1It's necessary to use integration by parts to find this integral as there are two x f...
Price in March = a Price in April = a x 1.2 = 1.2aNumber sold in March= b Number sold in April = b x 0.75 = 0.75bIncome = Price x Number soldIncome in March = abIncome in April = 0.9abDecrease is ...
5x + y = 21x - 3y = 9First, multiply the equation one by 3 so we can cancel out the y's.15x + 3y = 63 (we've now multiplied this by 3)x - 3y = 9Now we can add the two equations together, thus adding 3 and...
Factorise using a suitable method (eg product and sum) to find (6x-4)(x+2) = 0Hence x = 4/6 and x = -2.
We see this question is about conditional probability. Because a person chosen at random from the group satisfies a 1st condition: they have a blue car. And after we know this, they have to satisfy a 2nd ...
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