TR is the tangent to the circle PQR with centre O. Find the size of ?PRT

Solve me equation: 2/3 (x + 5) = 1/4(5x - 3)

A and B are two sets. The number of elements in A∪B is 49, the number in A is 22 and number in B is 34. How many elements are in A ∩ E?

Simplify log39 + log315 - log35

A student found the approximate value of 0.02548 correct to two places of decimal instead of two significant figures. Find the percentage error.

Which of the following equations has its roots as 4 and -5?

If P = {3, 5, 6} and Q = {4, 5, 6} then P∩Q equals

Express (0.0425 / 2.5) as a fraction

Solve the equations: 4x -y = 11; 5x + 2y = 4.