What value should come in place of the question mark (?) in the following question?

52x14+145018=1998÷?

Find the volume (in cub.cm) of a sphere of diameter 42 cm

The area of a semicircle is 308 sq.cm. Calculate its perimeter (in cm)

If the length of one side and the diagonal of a rectangle are 8 cm and 17 cm respectively, then find its perimeter

If x = [1/(√5 + √3)], y = [1/(√7 + √5)] and z = [1/(√7 + √3)], then what is the value of (x + y + z)?

Rahul’s salary is 40% of Mohit’s salary. If Rahul’s salary is increased by 60% and Mohit’s salary is decreased by 20%, then Rahul’s salary will be how much percentage of Mohit’s salary?

An isosceles triangle ABC has sides AB = AC. If side BA is produced to D in such a manner that AC=AD. Then what will the measure of the angle BCD?

Choose the CORRECT option if the two sides of a triangle is of length 4 cm and 10 cm and the length of its third side is a cm.

If 2x2+2y2=4a the find the value of 2ax2-a+2ay2-a