The formula for the ratio of radioactive carbon, R, to non-radi
from an organism that died T years ago is approximated by the
is the ratio of radioactive carbon to nonradioactive carbon in
of Ais left after 2500 years?

step-by-step explanation:

this is not possible to solve with the info given.   you need at least an one angle somewhere.

definitely a. the others have almost all data points on one side of the line.

step-by-step explanation:

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 -

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