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There are two questions here. WikiAnswers is designed to give one answer for one question. Please write out each question as one question and someone will answer each one.
To calculate your grade, you need to know how much each question is worth. If each question is worth the same, you can divide the number of correct answers (80 - 3 = 77) by the total number of questions (80) and multiply by 100 to get a percentage. If each question is worth different points, you'll need to know the point value of each question to calculate your grade.
About 2.9 points, so 3
That depends on what you mean by the question. Are you asking: "6 + 3/3" or "(6+3)/3"? The answer to the first is 7. The answer to the second is 3.
Your question is actually: "What is 'x' if [18 = 3 + 5x] ?"18 = 3 + 5xSubtract 3 from each side of the equation:15 = 5xDivide each side by 5:3 = x