Answer:
1120 combinations of four teachers include exactly one of either Mrs. Vera or Mr. Jan.
Step-by-step explanation:
The order in which the teachers are chosen is not important, which means that the combinations formula is used to solve this question.
Combinations formula:
is the number of different combinations of x objects from a set of n elements, given by the following formula.
In this question:
1 from a set of 2(Either Mrs. Vera or Mr. Jan).
3 from a set of 18 - 2 = 16. So

1120 combinations of four teachers include exactly one of either Mrs. Vera or Mr. Jan.
I'd definitely factor 4x^2-48 first. Factors are (4)(x^2-12).
This factors further: (4)* (x-2sqrt(3) ) * (x+2sqrt(3) )
Answer:
1r-1r
Step-by-step explanation:
srry if its wrong i took that class a couple months ago
Answer:
3/6 units
Step-by-step explanation:
distance is always positive
____-4/6_______________-1/6__0___________
|-4/6 - (-1/6)| = 3/6
A is true, b is true, but c d aren’t and e is