OpenStax, Prealgebra 2e §7.4 Properties of Identity, Inverses, and Zero · Exercise 54 · Algebra · Functions

Properties of Identity, Inverses, and Zero · Exercise 54

Cooking time Helen bought a $24 - pound$ turkey for her family’s Thanksgiving dinner and wants to know what time to put the turkey in the oven. She wants to allow $20$ minutes per pound cooking time.

ⓐ Calculate the length of time needed to roast the turkey by multiplying $24 \cdot 20$ to find the number of minutes and then multiplying the product by $\frac{1}{60}$ to convert minutes into hours.
ⓑ Multiply $24 (20 \cdot \frac{1}{60}) .$
ⓒ Which of the Properties of Real Numbers allows you to multiply $24 (20 \cdot \frac{1}{60})$ instead of $(24 \cdot 20) \frac{1}{60} ?$

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OpenStax, Prealgebra 2e · §7.4 Properties of Identity, Inverses, and Zero · Exercise 54

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