Type the correct answer in the box. Spell all words correctly. What is the term used for relaxation of heart muscles that causes blood to fill in the heart chambers? is the relaxation of heart muscles that fills the heart chambers with blood.

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Raul has one solution that is 20% acid by volume and one solution that is 50% acid by volume. he plans to mix together some of each solution to create 30 milliliters of a solution that is 40% acid by volume. how many milliliters of the 20% acid solution should raul use to create the 40% acid solution? can someone explain this to me? i know that the answer is 10 milliliters, but i don't know how to get it.

Which of these statements is the most accurate description of olmec culture? a.) they destroy the aztecs. b.) it was located in the andes mountains. c.) it contained the first complex civilization in mesoamerica. d.) they had a sophisticated written language that was destroyed by europeans.