Please can someone help

a) 0

b) 1

c) 0

Step-by-step explanation:

These are common values from the unit circle but you could also just check with your calculator. Just be sure to set it to degree mode and not radian mode.

11 lots are for sale.

Step-by-step explanation:

This is as simple as:

Since Mr. Smith divided the land into 1/2 acre lots, you'd just divide it by the amount he has.