Melanie began studying a sample of the chemical element einsteinium-253, whích naturally loses its mass
over time.
The relationship between the elapsed time, t, in days, since Melanie started studying the sample, and the
total mass remaining in the sample, M(t), in micrograms, is modeled by the following function:
t
M(t) = 169.(0.96)
Complete the following sentence about the daily percent change in the mass of the sample.
Every day
% of mass is
added to / subtracted from v
the total mass of the sample.

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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 -

|-23|, |29|, |34|, |-38|, |-45|, |-47|, |-59|,   |67|, |-78|, |-110|, |-514|, |710|

step-by-step explanation:

absolute value gets rid of any negative