Avoid wikipedia, anyone can put answers down on there and make it seem correct but it is not. Do not trust any website research the websites or look at ratings if possible. Use the answers that google provides itself if possible. And research trusted websites.
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Answer:
The expression is :
π[cd) + π(g,h) ],[π(e,f)+π(a,b)])
We will use foreign key and primary key
Answer:
Not sure what language, but in python a super basic version would be:
val1 = 98
val2 = 87
val3 = 84
val4 = 100
val5 = 94
sum = val1 + val2 + val3 + val4 + val5
avg = sum / 5
print(avg)
Explanation: