how represent this function?

i need help...I have to represent this function in matlab. a,b,p,s,d,p are numbers that i know...

First, i have to represent in function of d...varying d...

After, i have to represent with d as a constant and varying s..(if change s, change p too..because calculation of p depends of b).

please help :(

[Guillaume]

1. Your expression is missing a closing bracket, either after (1-p) or after b/d.
2. As this is homework, you will have to show some effort before we help you. Or ask a more specific question on a bit that's tripping you rather than 'do this for me'