Does anyone know how to do this? i need help with #14 asap!!

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?

In two or more complete sentences, determine the appropriate model for the given data and explain how you made your decision. (1,-1), (2,0.5), (5,1.5), (8,2)

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d? are he re