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------------------------------------------------ The new cookbook gives all oven temperatures in degrees Celsius, but your oven uses degrees Fahrenheit. Additionally, your oven runs hot, so you always decrease the prescribed temperature by [tex]15^{\circ} F[/tex].

Write an expression using a composition of functions to determine how high to preheat your oven when a recipe calls for a temperature of [tex]t^{\circ} C[/tex].

**Hint:** Use the conversion formulas:

- [tex]C = \frac{5}{9}(F - 32)[/tex]
- [tex]F = \frac{9}{5}C + 32[/tex]

to convert between degrees Celsius [tex]C[/tex] and degrees Fahrenheit [tex]F[/tex].

Answer :

The expression to determine how high to preheat your oven when a recipe calls for a temperature of [tex]t^{\circ} C[/tex] is [tex]\frac{9}{5}t + 17[/tex].

To solve this problem, you'll need to use a composition of functions that first converts the Celsius temperature to Fahrenheit, and then adjusts the temperature for your oven.

  1. Convert Celsius to Fahrenheit:

    The formula to convert from degrees Celsius [tex]C[/tex] to degrees Fahrenheit [tex]F[/tex] is:
    [tex]F = \frac{9}{5}C + 32[/tex]

    Here, we will define a function [tex]f(C)[/tex] that represents this conversion:
    [tex]f(C) = \frac{9}{5}C + 32[/tex]

  2. Adjust the Oven Temperature:

    Since your oven runs hot and you need to decrease the temperature by [tex]15^{\circ} F[/tex], we'll create a function [tex]g(F)[/tex] to account for this:
    [tex]g(F) = F - 15[/tex]

  3. Compose the Functions:

    To find the temperature to which you should preheat your oven, apply the oven adjustment function to the temperature obtained from the conversion function. This composition of functions is represented as [tex]g(f(C))[/tex]:
    [tex]g(f(C)) = \left( \frac{9}{5}C + 32 \right) - 15[/tex]

    Simplifying the expression:
    [tex]g(f(C)) = \frac{9}{5}C + 17[/tex]

The expression for how high to preheat your oven in Fahrenheit when the recipe calls for [tex]\(t^\circ C\)[/tex] is F = 9/5t + 17

The conversion formulas are given as follows

- Celsius to Fahrenheit: F = 9/5C + 32

- Fahrenheit to Celsius: C = 5/9(F - 32)

First, we convert the temperature to Fahrenheit (F)

We use the formula F = 9/5C + 32, where [tex]\( C = t^\circ C \)[/tex]:

F = 9/5t + 32

Since the oven runs hot by 15°F, we subtract 15°F from the result:

F = 9/5t + 32 - 15

F = 9/5t + 17