Answer:
If Father is four times older than Mary, that would be 4 times 10-- which equals 40. Five years ago, Mary must have been 5 years old. So, multiply 7 and 5 and you'll get 35! Father would have been 35 years old.
I hope this helps!
Step-by-step explanation:
I think it is 0 because I googled it.
Answer:
-1y² the rest is right
Step-by-step explanation:
6.5 is the mean of the data