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Questions in Grade Middle-school

[Jawaban] What is 3,465 in expanded form?

[Jawaban] Jack has two square-based pyramids that are the same size. He sticks the square faces together to make a new 3D shape. How many faces and how many edges does his new 3D shape have?

[Jawaban] Write the missing number: \[ 12.5 \div \, ? \, = 7.5 \div 1.5 \]

[Jawaban] What is the cube root of 81?

[Jawaban] What is the percentage discount if $70 is discounted to $63?

[Jawaban] When a car travels around a curve in the road, what helps to keep the car traveling in a curved path?

[Jawaban] Naomi has earned $54 mowing lawns over the past two days. She worked 2 1/2 hours yesterday and 4 1/4 hours today. If Naomi is paid the same amount for every hour she works, how much does she earn per hour to mow lawns?

[Jawaban] What would happen if the cell membrane became impermeable instead of selectively permeable? Could the cell remain alive?

[Jawaban] Has anyone ever read "Their Eyes Were Watching God"?

[Jawaban] Explain why the moon is always half illuminated and half dark, no matter where it is in the lunar cycle.