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In a bag of 25 coloured balls, 7 are orange, 6 are yellow and the rest are green. Laura picks out a ball and records its colour but doesn't return it to the bag, she then repeats this twice more. What is the probability of Laura getting 3 yellow balls?

Answer: 1/115 The easiest way to solve this problem is to draw part of a tree diagram to see the probabilites of each colour being picked each time Laura pulls a ball out of the bag (a full diagram isn't nee...
MS
Answered by Manon S. • Maths tutor
3645 Views

Is there an easy way to remember all the basic graphical transformations?

Well yes! Say you're given an equation of y=f(x), you begin by sketching the graph if plotting it is not part of the question, the reason you do this is to get an idea of what the graph looks like (turning p...
DM
Answered by Dimuthu M. • Maths tutor
4205 Views

How do we integrate x^2?

(x^3)/3 + C
MK
Answered by Mueen K. • Maths tutor
4280 Views

How do I rationalised and simplify surds?

Say I have a fraction with 2 surds, such as √10 / √6. To rationalise this, we need to get the dominator (bottom fraction) to be an integer. As √10 / √6 x 1 still gives √10 / √6, and we can write 1 as √6 / √6...
TG
Answered by Tabitha G. • Maths tutor
4975 Views

Ian earns £420 a week after a 5% rise. What was his pay before?

Ian had a 5% rise, so £420 = 105% of his original pay To find 1% of his original earnings, divide £420 by 105. Multiply this by 100 to find his old pay: 1% of his original earnings = 420/105 = £4 Original ea...
HS
Answered by Haris S. • Maths tutor
7970 Views