How do you write y=4x^2 -64x -265 in vertex form

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Find the value of the cosine for angle a

What is another way to express 36 +32