If terri were to paint her living room alone, it would take 6 hours. her sister gloria could do the job in 7 hours. how many hours would it take them working together? express your answer as a fraction reduced to lowest terms, if needed.

C = 42/ 13 hours or  3 3/13 hours

Step-by-step explanation:

The formula is

1/A +1/B = 1/C

where A is the time for person 1 to do the job alone

B is the time for person B to do the job alone

C is the time for them to do the job together

1/6 + 1/7 = 1/C

The common denominator is 42C so multiply each side by 42C

42 C*(1/6 + 1/7) = 1/C *42C

Distribute

7C +6C = 42

13 C = 42

Divide each side by 13

C = 42/13

Changing to a mixed number

C = 3 3/13 hours

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

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im not sure