exam Maths Puzzle Numerical Ability

Your companies bonds have a 14% coupon rate. Interest is paid semi-annually. The bonds have a par value of $1,000 and will mature 10 years from now. Compute the value of your comp

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problem: log (base 2) 35
This is what I have done:
log (base 2) (5 x 7)
log (base 2) 5 + log (base 2) 7
I do not know how to find the log base of 2 and the 5, and same for the base 2 and 7. On my TI-84 plus.
If a bag contains 15 marbles, how many samples of 2 marbles can be drawn from it? How many samples of 2 can be drawn in which both marbles are blue?