A radioactive substance decays according to A = Age-0.0005t, where A, is the initial amount and t is the time in years. If A, = 380 grams, find the time for the radioactive substance to decay to 254 grams. Round your answer to two decimal places, if necessary.

Cone a has a surface area of 384 ft2 and cone b has a surface area of 96 ft? . what is the ratio of their volume?

What is 10+10+20 about the origin the square root of a triangle.

Amy is plan her school's new basketball court. the west edge of the basketball court is located on the line y = 5x + 2. the east edge cannot intersect with the west edge. on which line could the east edge be located? −y − 5x = 100 y + 5x = 100 −5x − y = 50 5x − y = 50