Please help me. and HURRY which is the correct answer??

Which of the following graphs represents the function f(x) = 2^x

Iam at home. /: i am playing video games. translate the following statement into symbolic form.

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