Question

1. karina makes x dollars per hour working at the grocery store. she makes y dollars per hour working at the library. one week she worked 9 hours at the grocery store and 12 hours at the library. determine if each statement is true or false. a. the expression 21x represents karina’s earnings from the library. true false b. the expression 9y represents karina’s earnings from the grocery store. true false c. the expression 9x + 12y represents karina’s total earnings for the week. true false

Explanation:

Step1: Analyze part a

Karina's library earnings: $12 \times y = 12y$. $21x$ does not match this.

Step2: Analyze part b

Karina's grocery earnings: $9 \times x = 9x$. $9y$ does not match this.

Step3: Analyze part c

Total earnings = grocery earnings + library earnings = $9x + 12y$. This matches the expression.

Answer:

a. False
b. False
c. True