How to find the answer to this 5g=230 how do i find this plz now

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

Samantha is growing a garden in her back yard. she spend $90 setting up the garden bed and buying the proper garden supplies. in addition, each seed she plants cost $0.25. a. write the function f(x) that represents samantha's total cost on her garden. b. explain what x represents. c. explain what f(x) represents. d. if samantha plants 55 seeds, how much did she spend in total?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?