Convert number from scientific notation to standard notation 1.25×10^-7

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

When is g(x) = 0 for the function g(x) = 5.23x + 4?

Need so much on this one how many yards?