Answer:
1/18
Step-by-step explanation:
First of all, it works well to consolidate the minus signs:

We can multiply the first fraction by 9/9 and the second one by 2/2 so they have a common denominator.

Step-by-step explanation:
a.It is a controlled experiment because it is clearly seen that an established hypothesis or study is being verified through an experiment, now in this case the hypothesis is tested through an experiment where excessive stress is placed on the Participants during their math exam to effectively verify that people in urban or city areas live with more stress than people in rural areas.
2..As now that the previously established hypothesis has been verified, it is concluded that people who live in the city live with more anxiety and stress than people who live in rural areas.
Answer:
i used a cauculator cuz im not good at math so...
Step-by-step explanation:
it is 4.9e+15
You need 1 cup of sugar, 9/4 cups of flour and 3/2 cups of milk