Would it be - negative and would you add this -12+3. Example: -12+3= -15. I have not this for a long time.

If 1/2+2/5s=s-3/4,what is the value of s? a. s=3/4 b. s=25/12 c. s=-25/12 d. s=-3/4

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

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab