How to write 18,801,310 in expanded form using exponents

Me! #1 write an equation for the interior angles of this triangle that uses the triangle sum theorem. #2 what is the value of x? #3 what is the measure of #4 classify the triangle above as acute, obtuse, or right. state your reason in a complete sentence.

Bring the fraction a/a-4 to a denominator of 16-a^2

(x-5)1/2+5=2 what is a possible solution?