The inequality equation of the total amount in dollars that Elena spends on supplies is d ≥ 40.
Inequality is simply a type of equation that does not have an equal sign in it. Inequality is defined as a statement about the relative size as well as is used to compare two statements.
Elena is planning to go camping for the weekend and has already spent $40 on supplies. She goes to the store and buys more supplies.
Let d be the total amount. Then we have
d ≥ 40
More about the inequality link is given below.
https://brainly.com/question/19491153