Question

Please help

Answer 1

For question 1 apply the order of operation rule. PEMDAS

Answer 2

So in this case you'd look at the exponent first which is -1. 10^-1= 1/10

Now you have a negative sign remaining so put those two together and you get your answer

Answer 3

You have a lot of questions there that can easily be answered via calculator... I like to use https://www.wolframalpha.com/