Mathematics, 03.01.2020 02:31, sophiaa23

Hello,
can anyone me solve the last three questions? the document below is a copy of my brother's homework. questions (b.) and (c.) go along with question ( question (4) is unrelated. i would love to give him a step by step explanation for each question. i will give the "brainliest" to whoever provides the most thorough work.

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Hello,
can anyone me solve the last three questions? the document below is a copy of my bro...