Top answers

A bag contains 8 oranges, 9 pears and 13 apples. What is the probability a pear is picked?

The probability of an event happening is defined as the number of outcomes you're looking for (in this example the number of pears, 9) divided by the total number of outcomes (i.e. the total number of fruit ...
MP
Answered by Marcus P. • Maths tutor
3572 Views

The gases X & Y react with each other to produce gas Z according to the equation: 2X + Y ->2Z. 100cm3 of gas X was mixed with 10cm3 of gas Y, in a freely moving sealed gas syringe The reaction went to completion. What was the final volume of the syringe?

What's the key information we need to extract from the question: reaction went to completionmolar ratios of X, Y and ZGas Y is the limiting factor & Gas X is in excess If gas Y is the limiting factor, an...
AT
5928 Views

What are tariffs and why are they used?

Tariffs are a tax a government puts on good which are imported into a country. This increases the price per unit of the imported good and is often used by governments o attempt to encourage individuals to pu...
NF
Answered by Nathan F. • Economics tutor
2625 Views

Expand the following brackets: a) 4(x+3) b) 3(x-1)-2(x+5) c) (y-3)^2 d) (y-2)^2 + (y+3)^2

a) 4x + 12 For this question you must expand out the bracket by multiplying the subjects within by the number at the front. 4x + (4 x 3) = 4x + 12 b) x - 13 Although this question looks more confusing, you s...
JF
Answered by Jasmin F. • Maths tutor
5624 Views

If a car drives at 5 ms^-1 for 10 seconds and then 6 ms^-1 for 5 seconds, how far has it travelled in total?

The equation used here is speed = distance / time (s=d/t). Firstly the 30 ms^-1. Rearrange the equation to find distance (st=d). 5ms^-1 x 10s = 50m. The second stint is 6ms^-1 x 5s = 30m. This makes the tota...
MP
Answered by Marcus P. • Physics tutor
3069 Views