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Questions in Grade Middle-school

[Done] A building with a height of 40 ft casts a shadow that is 16 ft long. A person standing next to the building casts a shadow that is 2 ft long. How tall is the person?

[Done] Fill in the blanks to balance the equation: \[ \_\_\_ \text{Na}_3\text{PO}_4 + \_\_\_ \text{KOH} \rightarrow \_\_\_ \text{NaOH} + \_\_\_ \text{K}_3\text{PO}_4 \] How do I balance this equation?

[Done] When two fractions are between 0 and \(\frac{1}{2}\), how do you know which fraction is greater? Explain.

[Done] Mera painted equal sections of her bedroom wall to make a pattern. She painted \(\frac{2}{5}\) of the wall white and \(\frac{1}{2}\) of the wall lavender. Write an equivalent fraction for each using a common denominator.

[Done] Anne bought a necklace for each of her three sisters. She paid $7 for each necklace. Suppose she had $9 left. Write and solve an equation to find how much money Anne had initially.

[Done] After sales tax is added, the total cost of a $58 purchase is $61.48. What is the sales tax rate on the purchase?

[Done] Why can't you change the subscripts in a formula in order to balance a chemical equation?

[Done] Rocco wants to use the rest of the money in his savings account ($192) to buy a set of golf irons that has an original price of $350. Does Rocco have enough money to buy the golf irons? Explain.

[Done] Describe how trade contributed to United States territorial growth.

[Done] What is 16.6666667 rounded to the nearest tenth?