Here you go . 146 is the answer with the work shown.
Answer:
x<8
Step-by-step explanation:
2x+5>3x-3
2x+8>3x
8>x
Kevin is 6 and Daniel is 3 now (i.e., K is 3 years older than D)
2 years ago K was 4 and D was 1 (i.e., K was 4 times as old as D)
Why not look up "standard deviation" yourself, to be sure? But yes, the std. dev. is the sqrt of the variance.