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True probability of 2 consecutive balls picked being blue: (10/30)*(9/29)=3/29 which is 0.1034 (4 d.p.)

3/29-100% 0.2-x% so, x=0.2*100/(3/29)= 193.3 (1 d.p.) therefore Adam's result is 93.3 % (1 d....

The first thing you need to do to make this easier is to multiply out the brackets so that you can then move all the 'x' terms to one side and all the numbers to the other side. It would become: 7x=4x-32 ...

Draw a diagram breaking down 110 and 132 into their multiples (on whiteboard), e.g. 110=1110 132=1112 Circle the prime numbers, 11, and then break down the composite numbers (those that aren't pr...

We can split this power into two bits - the negative sign and the fraction.

Let's deal with the negative sign first and forget about the fraction.

So a negative always means '1 over', or the...

When multiplying powers: we add the powers together (3+6) so we get a^9 When dividing powers: we subtract the powers so a^6/a^3 =(6-3)= a^3 When adding or subtracting them we do not change the power. We m...