The population of a type of local frog can be found using an infinite geometric series where a1 = 84 and the common ratio is one fifth. find the sum of this infinite series that will be the upper limit of this population.

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