choose correct 1 sound travels faster in materials that are a) highly compressible and very dense b) least compressible and very the tendency c) least compressible and less dense d) highly compressible and less volume

I think it is A) but i may be wrong

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

your answer is c! hope this : )