Answer:
380
Step-by-step explanation:
Let 19x = no. of students
x = no. of teachers
Then, x + 19x = 400
20x = 400
x = 20
19x = 19(20) = 380
There are 380 students and 20 teachers.
mean = sum/n
mean = (5 + 7 + 7 + 9 + 12 + 16 + 21)/7
mean = 77/7
mean = 11
The appropriate choice is ...
... D) 1.0×10⁻³ inch
13
because a is the missing number. Well, 21 minus or - 8 is equal to 13.
the answers is (10^1)^3 = 1000