Answer:
Answer is 
.
Step-by-step explanation:
Total teens = 28
12 teenagers, in total, had a sister
7 teenagers, in total, had a brother
3 teenagers had both a sister and brother.
To get the required probability, we will consider the following two details:
3 teenagers have both a brother and sister and 12 have a sister.
Therefore, the probability that a randomly selected teenager who has a sister also has a brother will be = 
Answer is .
The radius of the base is 10 cm.
Solution:
Height of a cone = 15 cm
Volume of the cone = 1570 cm³
To find the radius of the base of the cone:
Volume of the cone = 
Divide by 15.7 on both side of the equation, we get
Taking square root on both sides of the equation, we get
⇒ r = 10
Hence the radius of the base is 10 cm.
Answer:
Step-by-step explanation:
Base of the triangle= 37•5m
Height of the triangle= 6•4m
Area of the triangle= 1/2 × base × height
= 1/2 × 37•5 × 6•4
= 120 m^2
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