Higher Plus

A histogram has two bars: one 10 units wide with frequency density 2.5, one 20 units wide with density 1.4. How many values in total?

Simplify 32 + 50, giving your answer in the form a b.Simplify sqrt(32) + sqrt(50), giving your answer in the form a sqrt(b).

Write x² + 10x - 9 in the form (x + a)² + b.Write x^2 + 10x - 9 in the form (x + a)^2 + b.

y is directly proportional to x². When x = 5, y = 50. Work out the positive value of x when y = 162.y is directly proportional to x^2. When x = 5, y = 50. Work out the positive value of x when y = 162.

The point (7, 24) lies on the circle x² + y² = 625. Work out the gradient of the tangent to the circle at that point.The point (7, 24) lies on the circle x^2 + y^2 = 625. Work out the gradient of the tangent to the circle at that point.