The temperature was -5° f at sunrise. during the day, it rose 15° f, dropped 7° f, rose 10° f and then dropped 8° f. write an expression to model the situation. what was the temperature at the end of the day? justify your answer

see explanation

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 -

2

step-by-step explanation:

i think the answer is b. i hope i !