exam Maths Puzzle Numerical Ability

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

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exam Other Question

Two friends are 60 mile apart. they decide to ride their bicycles to meet each other. sally starts from the college and heads east, riding at a rate of 21 miles per hour. at the sa 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