For the first digit youhave 10 choices. Forbthe second digit you have 10 choices. For the third digit you have 10 choices. By the fundamental counting principle the answer is 10×10×10=1000 ways to form a three digit number.
The answer is 1.496 times 10^9
The largest number that 8c could be is -15
Use index form. N= a^x becomes log a (N) = x
Therefore your question becomes (log 2.3 (13))/9 = x
And rounding to 3 decimals gives you 0.342
