👉🏼A is directly proportional to the square
of B. When B = 10, A = 20.
Find A when B = 20.

👈🏼Calculate the size of angle ABC:

👆🏼The population of country A is 4.5 x 10⁶ and the population of country B is 1.2 x 10⁷.

Work out the difference between the
population of country A and country B.
Give your answer in standard form.

👇🏼Twenty years ago, the population of
country A was 3.8 x 10⁶. Work out the percentage increase in the population of country A over the past twenty years.

🖐🏼Make a the subject in