math questions?

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can you plz help me im not so sure with my answers

a+6a=30 what is a?
5-x-x=-1 what is x?
72+4-14c=36 what is c?

2007-10-03 15:22:35 · 4 answers · asked by KING 3 in Education & Reference ➔ Homework Help

7a=30, so a=4.2857
-2x=-6, so x=3
-14c=-40, so c=2.8571

2007-10-03 15:28:52 · answer #1 · answered by Mike 7 · 0⤊ 0⤋

a= 30/7
x=3
c= 40/14

2007-10-03 22:26:31 · answer #2 · answered by stephanie l 5 · 0⤊ 0⤋

A=4.285714 or 30/7
X=3
C=2.857514 or 40/14

2007-10-03 22:27:02 · answer #3 · answered by Anonymous · 0⤊ 0⤋

a+6a=30
7a=30
a=30/7

5-x-x=-1
5-2x=-1
-2x=-1-5
x=6/2
x=3

72+4-14c=36
76-36=14c
40=14c
c=40/14
c=20/7

2007-10-03 22:32:10 · answer #4 · answered by MexicanCurious 3 · 0⤊ 0⤋