exam Maths Puzzle Numerical Ability

10-squae root of 81+4x2^4-(7+2+11)divided by 4

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exam Other Question

Hi I am a distance education student and new to geometry. I do not know where to start. Thanks for helping.
Lee Ann

Problem: Find the volume of a right circular cylinder, if its radius is
ten and its height is five less than its radius.
How many odd numbers of four different digits can be formed by choosing from the digits 1, 2, 3, 4, and 5?