5 The height of a ball t seconds after it is thrown is modelled by the function h(t) = -4.982 +240 +2, where h is the height of the ball in metres.
a Write down the initial height of the ball.
b Find the maximum height of the ball.
c Find the length of time the ball is at least 18 metres high,
d Find the amount of time elapsed when the ball hits the ground.

The table shows the age and finish time of ten runners in a half marathon. identify the outlier in this data set. drag into the table the ordered pair of the outlier and a reason why that point is an outlier.

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.