What is 2x84 I don’t know the answer to it

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

The expression 1.01*1.005(^t) gives the amount of money, in thousands of dollars, in carter's savings account (t) years after he opens it. what does 1.01 represent in this expression?