Please help I need this question to be correct!

What is the value with a place of tenths in 907.456 1) 0 2) 6 3) 4 4) 5

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days