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Questions in Grade Middle-school

[Open]The regular price of a shirt is $24. The sale price is $18. The sale price is what percent of the regular price?

[Open]Find a rational number between 1.7 and 1.8.

[Open]Solve this system by using substitution: \[ y = 7x - 10 \] \[ y = -3 \]

[Open]two numbers rational. between 0.3 and 0.4 express one as a decimal and fraction. explain why these numbers are rational

[Open]What factors distinguish one biome from another?

[Open]Use elimination to solve the system: \[ 6x - 4y = 6 \] \[ -6x + 3y = 0 \]

[Open]Find the least common multiple of 22, 44, and 264.

[Open]What is the simplest form of the fraction 4/10?

[Open]A rectangle has an area of 30 square meters and a perimeter of 34 meters. What are the dimensions of the rectangle?

[Open]Which process requires the removal of heat, melting or freezing? Is it evaporation? What is it? Why?