Answer:
The answer is "
".
Step-by-step explanation:
Calculating the critical value:
Freedom Degree= 7.
The significance level, 
Using excel function the critical value:

When
of the confidence intervals for the difference of means:
Answer:
savings = $360
spending = $160.
Step-by-step explanation:
saving : spending
9 : 4
total amount = $520
add the two parts in the ratio(9+4) to get the total parts.
9 + 4 = 13parts . so, 13 parts = 520.
what about 9 and 4?
13 = 520
9 = ?
9 × 520/13 = 360
4 × 520/13 = 160.
hope this helps.
So when you reflect the x-axis, you change the y negative. So (x,y) would be (x,-y). so it would be (-2, -6). If you want to reflect over the y-axis, it would be (-x, y).