Which indicator would you use to chose to identify an unknown substance as an acid or base? why?

Why did southern business leaders want to increase the number of slaves

Ineed to find the answer of this question because i dont understand it

1. if you have a gas at 127 degrees c, what is it's absolute temperature (kelvin)? a. 200kb. 300kc. 400kd. 500k2. if you had a gas whose absolute temperature measured 45 k, what is that temperature in celsius? a. -228 cb. -300 cc. 125 cd. 112 c