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Answer:
the answer is 247.7 cm²
see the attachment photo!
For the answer to the question above asking w<span>hat kind of sampling method is being used?</span>
<span>The answer is Simple random sampling because There was no sort of grouping or anything involved, and they tell you random numbers were used. </span>
1) $19.18
2) $948.75
3)$39.49
You will need 2 equations, since there are 2 variables (hours worked by George and the ones of Dorothy), let's say x and y respectively
We know
x+y=48 (since they work 48 hours together) and
12x+11.25y=555 (since the sum of their respective hours multiplied by their salary gives a total of 555$)
To solve that, you can isolate either one of the variables and replace it in the second formula, for example:
x+y=48, therefore x=(48-y)
<span>Substitute x in 12x+11.25y=555 and solve for y (to find Dorothy's hours)
</span><span>12(48-y)+11.25y=555
</span>576-12y+11.25y=555
21=0.75y
y=28