Daily Practice - Higher Plus

A block has mass 810 g (to the nearest 10 g) and volume 5 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 810 g (to the nearest 10 g) and volume 5 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

f(x) = 8x + 8. Work out the inverse function f^-1(x).f(x) = 8x + 8. Work out the inverse function f^-1(x).

A train slows steadily from 18 m/s to rest in 10 seconds. Work out its deceleration.

A triangle has sides of 7 cm and 7 cm and an area of 24.50 cm². Work out the acute angle between those two sides, to the nearest degree.A triangle has sides of 7 cm and 7 cm and an area of 24.50 cm^2. Work out the acute angle between those two sides, to the nearest degree.

A bag holds 11 counters, r of them red. Two are taken without replacement and P(both red) = 28/55. Work out r.