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The way to tackle this particular question requires the need for 2 formula equationsThe sum of all the interior angles of a regular polygon can be worked out by subtracting 2 from the number of sides, and...

By putting the bracket around (11+2-1) you are able to calculate that this then equals 12. This can the be put into the equation 12-(11+2-1)=0 which is 12-(12)=0. This then means that 12-12=0 giving you t...

Firstly, we need to take a factor of 2x out of the equation. This is because both 2x² and 12x can be divided by 2x. This gives us (2x)(x)+(2x)(6). If we then collect the terms 2x, we get 2x(x+6...

Last digit of n determines last digit of n^4. All even numbers divide by 2, so are not prime. Any number ending in 5 is a multiple of 5 so is not prime. Primes > 5 end in 1, 3, 7 or 9. If n ends in 1, ...

4m +3 >15 -3 from each side 4m >12 divide each side by 4 to get m on its own m>3