Higher Plus

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

y is directly proportional to x². When x = 5, y = 75. Work out the positive value of x when y = 75.y is directly proportional to x^2. When x = 5, y = 75. Work out the positive value of x when y = 75.

The point (20, 21) lies on the circle x² + y² = 841. Work out the gradient of the tangent to the circle at that point.The point (20, 21) lies on the circle x^2 + y^2 = 841. Work out the gradient of the tangent to the circle at that point.

A bag holds 5 red, 6 blue and 5 green counters. Two are taken without replacement. Given neither is green, what is the probability both are red?

A histogram has two bars: one 10 units wide with frequency density 1.5, one 5 units wide with density 3.5. How many values in total?