the element unobtainium has a half-life of 3 years. let m(t) be the mass of unobtainium at time t starting with an initial amount of 14 kg.

When your working with the passage-based reading questions on the psat do all of the following except. a)make sure you read each question throughly. b) try to answer each question before you look at the answers. c) plan to spend most of your time reading the passage. d) make sure your answer choice is the most correct number me

Select all that apply. select six of the aspects summarized in this section in which god's goodness is imparted to his people. mercy truth righteousness love compassion grace holiness strength majesty perfection

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.