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How do you work out the old price of an item having been given the new price after a specified percentage change?

These problems can be worked out using the equation: new = old x multiplier Where: new : is the new price of an item old : is the old price of an item (before it was changed) multiplier : is the percentage o...
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Answered by Rachael T. • Maths tutor
29750 Views

How do you go about rearranging equations where the required subject appears on both sides? Such as making x the subject of 7x + a = 3x + b.

To rearrange any equation, you must always do the same to both sides. If you take a number from one side, you must also take it from the other. If you divide a side by one number you must divide the other by...
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Answered by Rachael T. • Maths tutor
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Find the area encompassed by y=(3-x)x^2 and y=x(4-x) between x=0 and x=2.

This is an integration question. The limits have been provided. Firstly find the integral for the first curve int{x(4-x)}dx int{4x-x 2 }dx 2x 2 -x 3 /3 Apply the limits x=2,0 [2(2) 2 -(2) 3 /3]-[2(0) 2 -(0) ...
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Answered by Anthony D. • Maths tutor
3984 Views

How do I multiply 2 matrices?

To multiply two matrices we need to name them A and B. If for example we have 2 2X2 square matrices we know this will create a 3rd 2x2 martix For this example we will use : A: 2 -1 3 4 and B: 5 0 -2 -2 To mu...
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Answered by Ciara R. • Maths tutor
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How do i solve a system of 2 equations?

This problem is one that can be confusing if not tackled orderly. Let us have an example of a system of 2 equation: 3x + 5y = 13 4x + 7y = 18 First we must choose one of the two and then express one of our v...
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Answered by Ioan I. • Maths tutor
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