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Two ordinary fair dice are rolled. Work out the probability that both land on a value less than 4.

The probability of an event= Number of ways an event can occur/ Total number of possible outcomesBoth dices land on values less than 4. This means they both can be 1,2 or 3. Therefore, number of ways the ...

Answered by George S. • Maths tutor

6140 Views

Explain the trend of first ionisation energy down a group.

The first ionisation energy is the energy required to remove one electron from an atom. Down a group, there are more electron shells surrounding the nucleus, which results in a greater shielding from the ...

Answered by Rachael W. • Chemistry tutor

1858 Views

g(x) = ( x / (x+3) ) + ( 3(2x+1) / (x^2 + x - 6) ). Show that this can be simplified to: g(x) = (x+1) / (x-2).

Step 1: The denominator of the right-hand fraction is quadratic, so we can factorise this to (x+3)(x-2). This looks similar to the denominator of the left-hand fraction, suggesti...

Answered by Amar S. • Maths tutor

5596 Views

Give TWO similarities in the movement of substances by diffusion and by osmosis.

(Movement) down a gradient / from high concentration to low concentration; 2. Passive / not active processes; OR Do not use energy from respiration / from ATP / from metabolism; OR Use energy from ...

Answered by Murtaza S. • Biology tutor

11207 Views

A curve has the equation: x^2(4+y) - 2y^2 = 0 Find an expression for dy/dx in terms of x and y.

First of all expand the brackets in the equation. Then you can differentiate each term with respect to x. As one of the terms will be a product of x and y the product rule must be used to find the differe...

Answered by Carlotta M. • Maths tutor

4093 Views