Higher Plus

A histogram has two bars: one 10 units wide with frequency density 0.4, one 20 units wide with density 1.4. How many values in total?

Simplify 8 + 50, giving your answer in the form a b.Simplify sqrt(8) + sqrt(50), giving your answer in the form a sqrt(b).

In an algebraic proof, how would you write the next even number after 2n in terms of an integer n?

y is directly proportional to x². When x = 6, y = 144. Work out the positive value of x when y = 144.y is directly proportional to x^2. When x = 6, y = 144. Work out the positive value of x when y = 144.

The point (12, 16) lies on the circle x² + y² = 400. Work out the gradient of the tangent to the circle at that point.The point (12, 16) lies on the circle x^2 + y^2 = 400. Work out the gradient of the tangent to the circle at that point.