1) The answer would be x=0.7 or x=[tex]\frac{7}{10}[/tex]
2) Your answer would be C. 2k+3=5.4
3) Your answer would be x=124.16 where the 6 is repeating or x=[tex]\frac{745}{6}[/tex]
4) [tex]\frac{2a}{7}+\frac{6}{7} =\frac{5}{7}[/tex], [tex]\frac{4a}{7} +\frac{3}{7}=\frac{1}{7}[/tex]
5) I am sorry, I do not understand number 5.
6) Your answer would be answer choice B. x=1.1 satisfies the equation because 7-1.5=5.5 and 1.1*5=5.5.
7) None of those equations is equal to the answer.
8) None of those equations is equal to the answer.
I hope this helps.