High School

**Lesson 5.1 Activity**

**Lesson 5.1 Homework**

**Name:**

1. The number of shoppers in a shopping mall, [tex] t [/tex] hours after it opens, is given by [tex] S(t) [/tex]. The number of store clerks needed to attend to [tex] s [/tex] shoppers is given by [tex] C(s) [/tex]. Interpret the statement [tex] C(S(3)) = 11 [/tex] in the context of this problem.

2. The new cookbook you just got gives all the oven temperatures in degrees Celsius, but your oven uses degrees Fahrenheit. Additionally, your oven runs hot and you always have to decrease the prescribed temperature by [tex] 15^{\circ} F [/tex]. Write an expression using a composition of functions that will determine how high you have to preheat your oven when a recipe from your new cookbook calls for a temperature of [tex] t^{\circ} C [/tex].

*Hint: [tex] C = \frac{5}{9}(F - 32) [/tex] and [tex] F = \frac{9}{5} C + 32 [/tex] are the equations to convert between degrees Celsius [tex] C [/tex] and degrees Fahrenheit [tex] F [/tex].*

Answer :

Sure! Let's break down each part of the problem step-by-step:

1. Interpreting the statement [tex]\(C(S(3)) = 11\)[/tex]:
- This notation involves two functions, [tex]\(S(t)\)[/tex] and [tex]\(C(s)\)[/tex].
- [tex]\(S(t)\)[/tex] represents the number of shoppers in the mall after [tex]\(t\)[/tex] hours from opening.
- [tex]\(C(s)\)[/tex] represents the number of store clerks needed for [tex]\(s\)[/tex] shoppers.
- The statement [tex]\(C(S(3)) = 11\)[/tex] means that 3 hours after the mall opens, the amount of shoppers is such that 11 store clerks are needed to attend to them.

2. Writing an expression using a composition of functions for oven temperature adjustments:
- You need to convert a given temperature in degrees Celsius (°C) to degrees Fahrenheit (°F), and then adjust it because your oven runs hot.
- The formula to convert Celsius to Fahrenheit is: [tex]\(F = \frac{9}{5}C + 32\)[/tex].
- Since your oven runs 15°F hotter than set, you need the actual setting to be 15°F lower.
- Therefore, for a recipe that calls for [tex]\(t\)[/tex]°C, the conversion to Fahrenheit is:
[tex]\[
F(t) = \frac{9}{5}t + 32
\][/tex]
- Adjust for the oven running hot by subtracting 15°F:
[tex]\[
\text{Adjusted Fahrenheit} = F(t) - 15 = \left(\frac{9}{5}t + 32\right) - 15
\][/tex]

By following these steps, you can interpret the statement and calculate the adjusted oven temperature using the given conversion formula and correction for your oven running hot.