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

52x14+145018=1998÷?

If y=2secθ and x=3tanθ then x29-y24 is

Two circles touch each other internally. The radius of the larger circle is 6 cm and the distance between the centre is 2 cm, then the radius (in cms) of the other circle is

The vertical angle A of an isosceles triangle ΔABC is three times the angle B of it. The measure of the angle A is

If a2+1=9a, (a≠0) then the value of a2+1a2 is

If x+5+1x+1=6 then the value of (x+1)3+1(x+1)3 is

Two trains start from a certain place on two parallel tracks in the same direction. The speed of the trains are 45 Km/hr and 40 Km/hr respectively. The distance between the two trains after 45 minutes will be

The number of students in a class is increased by 20% and the number now becomes 66. Initially the number was

ΔXYZ is right angled at Y. If cosX = 3/5, then what is the value of cosecZ ?