Rachel, an engineering student, was asked to make a model shaped like a cylinder with two cones attached at its end by using the aluminium sheet. The diameter of the model is 3cm and its length is 12cm . if each cone has a height of 2cm , find the volume of air contained in the model that Rachel made.(Assume the outer and inner dimension of the model to be nearly the same).

How do you find the Maclaurin series for tanx?

Why is Axiom 5, in the list of Euclid’s axioms, considered a ‘universal truth’? (Note that the equation is not about the fifth postulate.)

The smallest composite number is ______.

(a) 2

(b) 4

(c) 1

(d) None of these

Find the arithmetic mean of the first ten odd natural numbers.

A boat goes 24 km upstream and 28 km downstream in 6 hours. It goes 30 km upstream and 21 km downstream in 6 hours and 30 minutes. The speed of the boat in still water is

A. 10 km/hr

B. 4 km/hr

C. 14 km/hr

D. 6 km/hr