Higher Plus

A histogram has two bars: one 20 units wide with frequency density 2.5, one 20 units wide with density 3.5. How many values in total?

A block has mass 620 g (to the nearest 10 g) and volume 6 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 620 g (to the nearest 10 g) and volume 6 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

The curve y = cos x° is drawn for 0 ≤ x ≤ 360. Write down the value of y when x = 270.The curve y = cos x° is drawn for 0 <= x <= 360. Write down the value of y when x = 270.

y is directly proportional to x². When x = 3, y = 27. Work out the positive value of x when y = 147.y is directly proportional to x^2. When x = 3, y = 27. Work out the positive value of x when y = 147.

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.