A pattern of letter arrangements begins with the 3 steps below. First, continue the pattern for 3 more
steps:
1. A
2. ABA
3. ABCBA
4.
5.
How many letters are in each step above?
How many letters do you think there will be in step 10?

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