#### Answer

d=-10-50t, -160ft

#### Work Step by Step

For the diver assembles at the elevation of -10ft , and he dives at the rate of 50ft/min , so the function rule of the depth(d) per minute (t)should be d=-10-50t . And when it is 3 minutes , we put 3 in -50t and get -150 , and then -10 to get the result 160ft .