Answer: b) -0.625
<u>Step-by-step explanation:</u>
The formula for the z-score is:

Answer:
Its better to buy this week because it is cheaper with using coupon.
Step-by-step explanation:
140 x 0.85 = 119
125 > 119
Of means multiplication
So

And then simplify the numerator ad denominator
=

And simplify the numerator and denominator again
=

And we are finally left with the answer which is
Distribute and combine like-terms!
-4x + 12x - 2x - 2
6x - 2