15
Step-by-step explanation:
A negative number being subtracted makes it positive
5 - -10
5+10 =15
-128y^2 x y^1 +2 = -128y^3
So i think in the school there may be 4800 in the school. Hope this helps
Answer:the correct answer is D
Step-by-step explanation:
Hope this help but can you tell me what your answer?
There are 25 species of trees, each with a known abundances. The question is how many possible ways to randomly select one tree there are.
We should calculate the number of combinations. Combinations, because we select item/s from a collection. In this case, when we select only one item, the combination is also a permutation. From set of n objects we select r. In our case: n=25, r=1.
The equation is: n!/r!(n-r)!= 25!/1!*24!=25*24!/24!=25
There are 25 different outcomes (events).
