I need to find the answere to a worksheets Unit 3 homework 2 Gina Wilson parallel and perpendicular lines

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

I’m not good at math can i have ? ?

What is 4 square root 7^3 in exponential form?