Eliza earns $400 per week plus $15 for each new customer she signs up. let c represent the number of new customers eliza signs up. write an expression that shows how much she earns in a week. then find how much eliza earns in a week in which she signs up 18 customers.

400+ (15c)

$670

Step-by-step explanation:

Eliza earns per week = $400

She earns for each new customer's signs up = $15

Let the number of new customers Eliza signs up = c

The expression that shows her earning in a week will be

400+ (15c)

If the number of customers that signs up = 18

The weekly earning of Eliza will be = 400+(15 × 18)

                                                          = 400 + 270

                                                          = $670

Eliza's earning in a week would be $670.

yes. we do proportions in probabilities.