Higher Plus

A histogram has two bars: one 10 units wide with frequency density 1.2, one 10 units wide with density 1.4. How many values in total?

Simplify 18 + 98, giving your answer in the form a b.Simplify sqrt(18) + sqrt(98), giving your answer in the form a sqrt(b).

Prove that the sum of 5 consecutive integers is always a multiple of 5. State the simplified sum you would use.

y is directly proportional to x². When x = 5, y = 50. Work out the positive value of x when y = 98.y is directly proportional to x^2. When x = 5, y = 50. Work out the positive value of x when y = 98.

The point (5, 12) lies on the circle x² + y² = 169. Work out the gradient of the tangent to the circle at that point.The point (5, 12) lies on the circle x^2 + y^2 = 169. Work out the gradient of the tangent to the circle at that point.