exam Maths Puzzle Numerical Ability

The sum of the digits of a two digit number is 12. The tens digit is three times the ones digit. What is the number ? Thank you

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exam Other Question

This is an extra credit question for my Honors Geometry Class-- I am in 8th grade

If a coin is flipped 4 times, find P (exactly 3 heads).

I do not know what my teacher is looking for- PLEASE HELP

THIS IS NOT A TEXTBOOK QUESTION!
Hi,
Can you help me with this math problem?

16.) Find the inverse of the function.

f(x)=log(x+9)

The answer should be f-1(x)=10^x-9