Write the simplest form: 2ab+5b-a
Note:the answer is a+5b but please tell how it came?

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The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at __ link to graph: .

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)