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Questions in Grade Middle-school

[Done] Explain how to use a number line to find the opposites of the integers 3 units away from -7.

[Done] What is the mean of the following numbers: 73, 45, 88, 90, 90, 81, 83?

[Done] Solve the system of equations algebraically: \[ 4x + 2y = 7 \] \[ y = 5x \]

[Done] When \(\frac{5}{8}x + \frac{4}{3}\) is subtracted from \(\frac{5}{4}x - \frac{31}{6}\), what is the result? Show your work, please.

[Done] What are two equivalent fractions for [tex]\frac{9}{15}[/tex]?

[Done] A number is K units to the left of 0 on the number line. Describe the location of its opposite.

[Done] How do you write 100,203 in word form?

[Done] 100 is \(\frac{1}{10}\) of what number?

[Done] Write an algebraic expression. The quantity 9 more than a number.

[Done] True or false: All rhombuses are rectangles.