Indeed, a fare of $40 is a fair charge for the cab ride.
Explanation
Sheri's cab fare totaled $32, with a gratuity rate of 20%.
The gratuity amount is: 
Thus, the total cab fare including gratuity is: 
Since Sheri issued a $40 check to the cab driver, it indicates she provided ($40 - $38.40) or an extra $1.60 to the cab driver. Consequently, the $40 payment is reasonable for the cab fare.
Response:
Step-by-step breakdown:
For the null hypothesis,
H0: p = 88
For the alternative hypothesis,
Ha: p < 88
In terms of population proportion, where the probability of success is p = 0.88
q represents the probability of failure = 1 - p
q = 1 - 0.88 = 0.12
Considering the sample,
Sample proportion, P = x/n
Where
x = number of successes = 21
n = total samples = 32
P = 21/32 = 0.66
Next, we determine the test statistic, which represents the z-score
z = (P - p)/√pq/n
z = (0.66 - 0.88)/√(0.88 × 0.12)/32 = - 3.83
The relevant p-value corresponds by referencing the normal distribution table for the area falling beneath the z-score. As a result,
P value = 0.00006
Answer:
The repair of the stretch of road will require
weeks to finish.
Step-by-step explanation:
Provided:
Length of the roads needing repair =
Length of the road workers can fix in a week = 
To ascertain how many weeks it will take to mend this road stretch.
Solution:
Worker's road repair rate = per week.
Overall road length to repair =

The time required to repair 
of road by the workers can be calculated:
⇒
When dividing mixed numbers, we change them first into fractions.
To compute fraction division, we take the reciprocal of the divisor and substitute division with multiplication:
⇒ 
We revert the fraction back into a mixed number.
Thus, it will take
weeks to complete the road repair task.