The expression 15j + 12s represents the total amount of money Jacqueline earns in a given period of time, where j is the number of hours she works as a lab assistant and s is the number of hours she works as a cashier.
For example, if Jacqueline works 10 hours as a lab assistant (j = 10) and 15 hours as a cashier (s = 15), the expression would be:
15(10) + 12(15) = 150 + 180 = $330
Therefore, in this case, Jacqueline would earn $330 in total.
Jacqueline has two part time jobs she earns $15 per hour j working as a lab assistant and $12 per hour s working as a cashier this is modeled by 15j +12s
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