What is a scale factor of 2
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What is the absolute value of the complex number -4-sqrt2i

What are the excluded values? m+5/mn+3m

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)