If \(4\sin^2 x - 3 = 0\), find the value of x, when 0° \(\leq\) x \(\leq\) 90°

In the figure above, |CD| is the base of the triangle CDE. Find the area of the figure to the nearest whole number.

The marks scored by 30 students in a Mathematics test are recorded in the table below:

What is the total number of marks scored by the children?

If given two points A(3, 12) and B(5, 22) on a x-y plane. Find the equation of the straight line with intercept at 2.

If P(2, m) is the midpoint of the line joining Q(m, n) and R(n, -4), find the values of m and n.