Answer:
No. of boys = 15
Step-by-step explanation:
Given that,
The ratio of boys to student is 3:7.
Number of girls in the school = 20
We need to find the number of boys in the school.
Let there are 3x boys and 7x number of students.
No. of girls = Total students - no. of boys
= 7x-3x
= 4x
ATQ,
4x = 20
x = 5
No. of boys = 3x
= 3(5)
= 15
Hence, there are 15 boys in the school.
Answer:
Step-by-step explanation:
The probability density function is :
With 0 < x < 3
To be a valid probability density function :
Where a < x < b
And also
f(x) ≥ 0 for a < x < b
Applying this to the probability density function of the exercise :
We can verify by replacing ''c'' in the original probability density function and integrating :
Also, f(x) ≥ 0 for 0 < x < 3
Answer:
give me a second and i will answer it
Step-by-step explanation:
Answer:
B is the correct answer
Step-by-step explanation:
if 2 1/2 gallons is 1/2 pint oil then 5 gallons would be 1 pint of oil, therefore 10 gallons would be 2 pints of oil
Given that the function y=3.5x+2.8 represents the cost y (in dollars) of a taxi ride of x miles, and that <span>you have enough money to travel at most 20 miles.
The domain of a function is the set of possible values of x, given that the maximum number of miles you can travel is 20 miles, the domain of the function is from 0 to 20.
Domain = {x: 0 ≤ x ≤ 20}
The range of a function is the set of the possible values of the function.
For x = 0, y = 3.5(0) + 2.8 = 2.8
For x = 20, y = 3.5(20) + 2.8 = 72.8
Therefore, the range of the function is from $2.8 when no mile was covered and $72.8 when 20 miles was covered.
Therefore, range = {y: 2.8 ≤ y ≤ 72.8}
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