How do i do this i do not freaking get this someone be kind enough toyou

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.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?