B because
Solve for the first variable in one of the equations, then substitute the result into the other equation.
Answer:
Answer:
50.2
Step-by-step explanation:

33.2 blah blah blah 20 character 33.2
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,