Because the two angles on the right add to 180 degrees, we can create this system:

We can also prove that

, which, when solved, shows that

.

When plugged in to the original equation, we find that y = 105 degrees.

Answer:

Width of confidence interval will increase.

Step-by-step explanation:

The sample size as an effect on the width of the confidence interval being calculated as it determines the value of the error margin. In general, increasing the sample size reduces the width of the confidence that interval while decrease in its value increases the error margin and hence the confidence interval.

Confidence interval :

Xbar ± Error margin

Error margin = Tcrit * s/ sqrt(n)

n = sample size

Being the denominator, a decrease in its value will result in an increase in error margin.

39*7.25% = 2.8275 roundup to 2.83

39+2.83 = 41.83 & that is the total cost after tax

ANSWER:

B

**Step-by-step explanation:**