Please HELP ME

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Ineed on the last 8 questions for this homework i’m trying to get all this done by tuesday when i got to my level 5 teacher if i have passed my tabe