Could anyone help me find this answer? im in 6th grade

Me write an equation for the interior angles of this triangle that uses the triangle sum theorem

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year