In 2012, the UK produced 200 million tonnes of waste. 14% of this was produced from households. How many tonnes of waste were produced by UK households in 2012? Give your answer in standard form.

A+b= 17, ab=70, find the value of |a-b|

Which of the following shows the graph of y=2e^x?

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.