"alexis, becca, and cindy do volunteer work at adopt-a-pet animal shelter. they worked a total of 285 hours at the shelter last summer. alexis worked 15 hours less than becca. cindy worked 4 more than twice as many hours as becca."

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Step-by-step explanation:

Givens

The expressions that model this problem would be

Because all together they work 285 hours.

Because Alexis worked 15 hours less than Becca.

Because Cindy worked 4 hours more than twice Becca's hours

Now, we replace the last two expression in the first one

Then, we replace this value to find others

Therefore, Alexis worked 59 hours, Cindy worked 152 hours and Becca worked 74 hours.

1. d.90

2. e. none of these (80)

3. a. 0

4. b. 6

5. e. none of these (10)

6. a. 5