A class has 20 students. If the teacher is randomly selecting a group of 3 students to represent the class on the student counci
2 answers:
Answer:
P(Sarah and her two best friends will all be chosen)=1/1140
Step-by-step explanation:
A class has 20 students.
The teacher is randomly selecting a group of 3 students to represent the class on the student council.
The number of ways of choosing 3 students out of 20=
= 1140
we have to find the probability that Sarah and her two best friends will all be chosen.
That means Sarah and her friends are one group to be chosen.
Hence, P(Sarah and her two best friends will all be chosen)=1/1140
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Given:
The table of values of an exponential function.
To find:
The function for the given table of values.
Solution:
The general exponential function is:
...(i)
Where, a is the initial value and b is growth factor.
From the given table it is clear that the function passes through the points (1,9) and (2,36). It means the function must be true for these two points.
...(ii)
...(iii)
On dividing (iii) by (ii), we get
Putting in (ii), we get
Putting in (i), we get
The function notation with variable n is:
Therefore, the correct option is D.