the rate of change of the amount of the chemical remaining is proportional to the amount remaining. At time t=0, the amount of the chemical is 15 moles. At time t=4, the amount of the chemical is 5 moles. At what time t is the amount of the chemical 3 moles? (A mole is a unit of measure used in chemistry.)

Select the statement that is not true about the hubble telescope: a. it orbits above the earth, avoiding the light distortion caused by our atmosphere. b. it is mounted high on a hawaiian mountaintop to provide stable images. c. it has allowed scientists to see the formation of far-away stars and solar systems, leadin some certainty about the history of our own solar system. d. it has documented the destruction of far-away stars and galaxies, leading to some certa the theories of the life cycles of stars.