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There are n sweets in a bag, 6 orange, rest yellow. H takes two, one after another, and eats them. Probability both are orange is 1/3. Show n^2 - n - 90 = 0.

First, we start with what we do know and this should lead us to the answer with steps inbetween. So the amount of yellow sweets to start is (n-6) but we want to focus on the orange sweets. This question is a...
NF
Answered by Nicole F. • Maths tutor
3780 Views

Solve the following definite integral from x=2 to x=-1: ((x^4) + 3(x^2) + 2) dx

GENERAL PROCEDURE -- To solve this equation you can separate and integrate each term on its own and then add each integral together. To find the definite answer: Substitute "x=2" into the integrate...
HW
Answered by Harriet W. • Maths tutor
3366 Views

A ladder 6.8m long is leaning against a wall. The foot of the ladder is 1.5m from the wall. Calculate the distance the ladder reaches up the wall.

For answering this question we need to understand Pythagoras theorem. It states that when a triangle has a right angle (90º) the square of the hypotenuse is equal to the sum of the squares of the two other s...
CV
Answered by Clara V. • Maths tutor
15991 Views

Factorise: 6x^2-3x-3=0

Since the equation shows a 6x^2, we know that in the brackets we must have either: (2x+a)(3x+b) or (6x+a)(x+b) However we know the last two numbers must multiply to make -3, hence a and b must be +1 and -3 r...
WP
Answered by William P. • Maths tutor
4517 Views

why does 4 / 0.5 =8?

would start by asking what is 4 * 0.5 ? They might then work out that that is 2 which would lead them to have a cognitive conflict which can be very useful as they can understand that the logic is wrong. I w...
KR
Answered by Kathleen R. • Maths tutor
11356 Views