Answer:
correct
Step-by-step explanation:
To answer this question, you'll need to use permutations and factorials.
Factorials are any integer with an ! after it. This means that all of the integers before that number are multiplied together with said number.
This question will use the following formula:
n represents the amount of items in a set, and r represents the amount of items in each combination within the set.
You have 18 students, and you can choose any combination of 3 students. Plug your values into the formula:
There are 4896 different combinations of students that Ms. Lunette can choose.
Answer:
Step-by-step explanation:
The formula for determining the the area of a sector is expressed as
Area of Sector = θ/360 × πr²
Where
θ represents the central angle.
π is a constant whose value is 3.14
r represents the radius of the circle.
From the information given,
The central angle is π/7 radian. Converting to degrees, it becomes
π/7 × 180/π = 180/7 = 25.714 degrees.
Area of sector = 77 square meters
Therefore
77 = 25.714/360 × 3.14 × r²
77 = 0.2243r²
r² = 77/0.2243 = 343.29
r = √343.29 = 18.53 meters