16 because it’s basic multiplication
Answer:
Step-by-step explanation:
This is a Combination (as in permutation vs combination) question the symbol (n r) refers to "n choose r". This is sometimes written as nCr
i.e the question is asking you to find how many combinations each will yield when you chose r items from n item without repetition and order does not matter.
I will only do the first question for you and you can just follow the same steps to solve the rest of the questions.
Recall that

Consider question a) we are given (5 1) or ₅C₁
we can see that n = 5 and r = 1
If we substitute this into the formula:
₅C₁ = (5!) / [ (1!)(5- 1)!]
= (5!) / [ (5- 1)!]
= (5!) / (4!)
= (5·4·3·2·1) / (4·3·2·1)
= 5
hence ₅C₁ = 5
Answer: The slant height of the cone is 65.6 m
Step-by-step explanation:
Given: The diameter of a cone = 10 m
Surface area of cone = 190.6 m²
To find: Slant height
Diameter of cone = 10 m
Therefore Radius of cone = 
As we know that surface area of a cone is given by

Where S.A. is surface area , r is the radius of cone and l is the slant height of the cone.
Let Slant height = l
So we have

Hence the slant height of the cone is 65.6 m
Answer:
<h2>y = 75 when x = 60</h2>
Step-by-step explanation:
To solve this, we will use a proportion, since x and y vary directly with each other.
16 / 20 = 60 / y
<h2>Step 1: Cross-Multiply</h2>
16y = 1200
<h2>Step 2: Divide both sides by 16</h2>
16y / 16 = 1200 / 16
y = 75
<h2>Step 3: Check</h2>
16 / 20 = 60 / 75
1200 = 1200 ✅
<h2>y = 75 when x = 60</h2>