Question

part b
which situation could be modeled by a function with a
domain that includes positive and negative real numbers?

a the height of a plant as a function of time since the
seed was planted

b the elevation of a hiker as a function of the number of
steps taken

c the amount of time required to read a book as a
function of the number of words in the book

d the amount of precipitation as a function of the
outdoor temperature

Explanation:

• Option a: Time since planting can't be negative, so domain has no negative numbers.
• Option b: Number of steps taken is non - negative (can't take negative steps), so domain has no negative numbers.
• Option c: Number of words in a book is non - negative, so domain has no negative numbers.
• Option d: Outdoor temperature can be positive (like 25°C) or negative (like - 10°C), so the domain of the function (amount of precipitation as a function of outdoor temperature) includes positive and negative real numbers.

Answer:

d. the amount of precipitation as a function of the outdoor temperature