A)
Let X be the food expenditure of a family.
Let the population mean of an expenditure of a family be.
Let the population standard deviation of an expenditure of a family be.
The proportion families spend more than $30 but less than $490 per month on food is,
1/2x-7=1/3x-4,
1/2x-3=1/3x,
1/2x-1/3x=3
1/6x=3/1/6
Final answer x=18
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Answer:
the answer is the first option
y=kx
y=100
K=13
100=k13
k= 7.69
Answer:
$18 was her allowance
Step-by-step explanation:
do it backwards