2/9 + (-1/2)
Simplify, 2/9 - 1/2
Change the denominator on both sides into the LCM of 2 and 9
Therefore, 4/18 - 9/18
The answer is -5/18
Answer:
2
There are 2 kilometers in 2000 meters
Step-by-step explanation:
Answer:
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Answer:
86%
Step-by-step explanation:
Let g represent the mean mark for the 10 girls in the class. Then the mean mark for the class was ...
10g +20(62%) = 30(70%)
g = 3(.7) -2(.62) . . . . . . . . . divide by 10 and subtract 2(.62)
g = .86 = 86%
The mean mark for girls was 86%.
_____
You can do this in your head if you consider it in terms of deviations from the mean. The second equation above can be rewritten and factored as ...
g = 70% +2(70% -62%)
That is, because there are 2 boys for every girl, the girl's score is above the mean by an amount that is 2 times the amount that the boy's score is below the mean. The boys' score is below by 8%, so the girls' score is above by 16%, so is 86%.
If it's 125 + 0.375 then the answer is 125.375
and for the second it's 0.75
