Answer:
Step-by-step explanation:
Total sum of age of 12 students = 12*18 = 216;
Total sum of age of 8 students = 8*23 = 184;
Total sum of age of 20 students = 216+184 = 400;
Mean age of all the students = total age / number of students;
= 400/20 = 20 year
Step-by-step explanation:
Answer:
8:10
Step-by-step explanation:
8 parts for brown sugar and 10 parts flour.
In simplest, 4:5 (divide 8 and 10 by 2)
Answer:
1
Step-by-step explanation:
1 1/3 makes 1/3
We have that
x²<span>-20x
</span><span>Group
terms that contain the same variable
</span>(x²-20x)
Complete
the square
(x²-20x+10²)------> (x-10)²
the answer is
the number must be 100