Hey yall do this real quick whats 5+3?

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

Is the square root of 4 plus the square root of 16 rational?