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The mean is the average of a set of numbers. You add all of your numbers together (example = 1+5+3= 9), then you divide the answer by the number of numbers you have used ( 9 divided by 3 = 3) so the mean is 3
1) 1/5x + 3=0
1/5x=-3
x=(-3)(5)=-15
2)6x-7=0
6x=7
x=7/6=1.17
3) -8/3x+9=0
-8/3x=-9
-8x=-27
x=27/8=3.375
Answer:
X=4
Step-by-step explanation:
Eveything is explained in the pic. Hope that helps ;)