I need help on this one and all the others please

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

There are 3232 forwards and 8080 guards in leo's basketball league. leo must include all players on a team and wants each team to have the same number of forwards and the same number of guards. if leo creates the greatest number of teams possible, how many guards will be on each team?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n