Solve: 3y - 6 = 15
a) -5
b) 3
c) 7
d) 11

C. 7

Step-by-step explanation:

3y - 6 = 15

+6          +6

3y = 21

 3      3

y = 7

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C) 7

Step-by-step explanation:

3y - 6 = 15

Add 6 to both sides.

3y = 21

Divide both sides by 3.

y = 7

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation: