HUGE POINTS!

tan x/2 =2,-1

The answers is 234 degrees.
How would I answer this.

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.