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An ordinary, fair sided dice is rolled 480 times. How many times is the number 3 expected?

An ordinary dice has six sides. We have an equal chance to roll on any of these six sides. This gives us the probability of rolling a 3 (or any other number) as 1/6.Each roll is independent i.e the result...

Answered by Louis P. • Maths tutor

6228 Views

How do I solve a quadratic equation: x^2-5x+6=0

When solving a quadratic equation, you have two options. Take the general form ax^2+bx+c=0Method 1: Solution by FactorisingWhen the numbers involved look fairly simple, look for a way to factorise the qua...

Answered by Naomi C. • Maths tutor

4012 Views

Expand and Simplify: (x+2)(x+3)(x−3)

(x+2)(x+3)(x−3)(x²+ 3x + 2x + 6)(x - 3) : Step 1 is to expand the first two brackets. (x²+ 5x + 6)(x - 3) : Step two is to simplify the quadratic. x³-3x²+5x

Answered by Alex H. • Maths tutor

9274 Views

How do I calculate rate coefficient units?

For any rate equation, the units have to be equal on either side of the equation. The rate of reaction always has the units mol dm^-3 s^-1, and the concentration species in the equatio...

Answered by Frances R. • Chemistry tutor

3103 Views

How do I start my essay?

Your introduction should always be a few sentences long, and should address the question directly. A good example of a question is 'How does Shakespeare present the theme of ambition in Macbeth?'Fo...

Answered by Kasie B. • English Literature tutor

5539 Views