Answer:
y = 2.5
Step-by-step explanation:
Given
10y - 5 = 20 ( add 5 to both sides )
10y = 25 ( divide both sides by 10 )
y = 2.5
For an arithmetic sequence, the nth term = the first term + d(n-1), d is the difference between two neighboring numbers, in this case, d is 5
the 20th term=-4+5(20-1)=91
Answer:
Oke..check the equations..cheeeckk did it now what?
Answer:
nope i dont understand
Step-by-step explanation:
Answer:
Pr (at least 1 blue ball) = 4/7
Step-by-step explanation:
Number of blue balls= 4
Number of red balls= 3
Total number of balls = 3+4 = 7
This is a case of probability without replacement since the ball taken at random isn't replaced.
Pr (blue ball) = 4/7
Pr (red ball) = 3/7
Where Pr means probability
Pr (at least 1 blue ball) = Pr (1 blue ball and 1 red ball) + Pr (2 blue balls)
In probability without replacement, after picking the first ball, only the total number of balls would change if the colours are different. It would reduce by 1.
But If the balls are the same, the total number of balls would reduce by 1 and the total number of same ball would also reduce by 1
Pr (1 blue ball and 1 red ball) = (4/7 × 3/6)
Pr (2 blue ball) = (4/7 × 3/6)
Pr (at least 1 blue ball) = (4/7 × 3/6) + (4/7 × 3/6)
Pr (at least 1 blue ball) = 12/42 + 12/42
Pr (at least 1 blue ball) = 24/42 = 4/7
Pr (at least 1 blue ball) = 4/7
