Answer:
- Please see the attached picture for full solution!:)
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I remember CUP -- concave up positive. Here we have a leading coefficient that's negative, so the cup is upside down, the parabola opens down, an arch not a bowl.
D = number of dogs washed
c = number of cats washed
d = (60 - 5c) / 7.50
The 7.50 should be underneath the brackets
Answer:

Step-by-step explanation:
The margin of error is computed using the formula:

The critical of <em>z</em> for 95% confidence level and 90% confidence level are:

*Use a <em>z</em>-table.
The sample size is n = 44.
Compare the MOE for 95% confidence level and 90% confidence level as follows:

