Daily Practice - Higher Plus

A histogram has two bars: one 10 units wide with frequency density 2.5, one 20 units wide with density 3. How many values in total?

A block has mass 720 g (to the nearest 10 g) and volume 3 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 720 g (to the nearest 10 g) and volume 3 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

Write x² + 8x - 13 in the form (x + a)² + b.Write x^2 + 8x - 13 in the form (x + a)^2 + b.

y is directly proportional to x². When x = 2, y = 28. Work out the positive value of x when y = 567.y is directly proportional to x^2. When x = 2, y = 28. Work out the positive value of x when y = 567.

The point (20, 21) lies on the circle x² + y² = 841. Work out the gradient of the tangent to the circle at that point.The point (20, 21) lies on the circle x^2 + y^2 = 841. Work out the gradient of the tangent to the circle at that point.