Given f(x)=5/2x+7,if f(x)=-13 find x

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?