Daily Practice - Higher Plus

On a histogram, a 5-wide bar and a 15-wide bar have the same frequency density of 2. How many more values are in the wider class?

A block has mass 430 g (to the nearest 10 g) and volume 13 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 430 g (to the nearest 10 g) and volume 13 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

Write x² - 8x - 14 in the form (x + a)² + b.Write x^2 - 8x - 14 in the form (x + a)^2 + b.

A cyclist speeds up steadily from 3 m/s to 17 m/s over 8 seconds. Use the area under the velocity-time graph to find the distance travelled.

The point (9, 40) lies on the circle x² + y² = 1681. Work out the gradient of the tangent to the circle at that point.The point (9, 40) lies on the circle x^2 + y^2 = 1681. Work out the gradient of the tangent to the circle at that point.