exam Maths Puzzle Numerical Ability

How many terms are there in each of the following sequences?
a. 51,52,53,54,...,151
c. 10,20,30,40,...,2000
d. 9,13,17,21,25...,353
e. 1,2,4,8,16,32,...,1024

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exam Other Question

I am to use interval notation for the solution set:

Please help

3x+9=3(x-3)

Here is another one:
3x<9 and 2x+1>3

Thanks, lackinmath My problem is:
14/(x^2-1)+1/(x-1)=3/(x+1)
I need to solve the equation- please help!!! Thank you.