Answer:
6 hours.
Step-by-step explanation:
Let t represent the time taken by apprentice in hours to make a set of glasses when working alone.
Part of work completed by apprentice in one hour would be
.
We have been given that a glassblower can produce a set of simple glasses in about 2 hours. So part of work completed by glassblower in one hour would be
.
While working together, the job takes about 1.5 hours. So part of work completed by both in one hour would be
.
Now we will equate sum of work competed by both in hour by work completed by both working together is one hour as:








Therefore, it will take 6 hours for the apprentice to make a set of glasses when working alone.
Just multiply then add them and if the answer is to big then add and if it is to small sorry not that good at math but I️ try
The cube root is 10 bc 10x10x10 = 100
C...to show this, interchange letters: x = (y+1)/(y-1)xy-x = y + 1xy - y) = x + 1y(x-1) = x+1y = (x+1)/(x-1) ⇐ this is f-1(x) and it's identical to f(x). Note: <span>the equal sign is missing in the definitions of the functions c. & d.</span>