Higher Plus

A histogram has two bars: one 20 units wide with frequency density 1.5, one 5 units wide with density 0.6. How many values in total?

Expand and simplify (3 + 10)(3 - 10).Expand and simplify (3 + sqrt(10))(3 - sqrt(10)).

In an algebraic proof, how would you write a multiple of 9 in terms of an integer n?

y is directly proportional to x². When x = 3, y = 72. Work out the positive value of x when y = 392.y is directly proportional to x^2. When x = 3, y = 72. Work out the positive value of x when y = 392.

The point (3, 4) lies on the circle x² + y² = 25. Work out the gradient of the tangent to the circle at that point.The point (3, 4) lies on the circle x^2 + y^2 = 25. Work out the gradient of the tangent to the circle at that point.