Lester is a sophomore at Wildgrove College. Last year, tuition was $7,320 per semester. This year, he paid $6,588 for each semester. What was the percent of decrease in the cost of tuition?

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step-by-step explanation:

correct answer:

b.(19,-2)

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step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -