Simplify cos (80) - sin (40).
cos (40) (cos (40) - sin (40))
sin (40) (2 cos (40) - 1)
1 - 8sin? (20) cos2 (20) - sin (40)
1 + 8sin2 (20) cos2 (20) + sin (40)

If you had $1,900,000, how many days would it take you to spend all if you spent $1 a second. (there are 86,400 seconds in a day)

The length of a rectangular piece of land is 92 yards more than three times its width. the perimeter is 760 yards. find its dimensions.

The bolo cavern outside of vandalia is 421 ft below sea level. a little more than75 miles away. mt owens is 7295 feet above sea level. what is the difference in elevation between the bolo cavern and mt owens?