Sqrt(3) cosec(140°)-sec(140°)=4

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?

Julia bought 7 hats a week later half of all her hats were destroyed in a fire. there are now only 12 hats left with how many did she start