4/105 In total there are 2+4+1+8=15 The probability of taking a blue is number of blue divided by number of total, so that would be 4/15. Since, it is not replaced, we can now say that there are 1 less marbles in the bag (since we took out a blue). Now probability of getting a green marble is:2/14=1/7
Answer:

Step-by-step explanation:
Given:
The given sequence is 3, 5, 7, 9
The difference between the second and first term is 5 - 3 = 2
The difference between the third and second term is 7 - 5 = 2
The difference between the fourth and third term is 9 - 7 = 2
So, there is a common difference of 2. Thus a sequence which has the same difference is known as an arithmetic sequence.
The explicit formula to determine the
term of an arithmetic sequence is given as:

Where, 
Plug in 3 for
and 2 for
. This gives,

Therefore, the explicit formula to represent the given sequence is:

Answer:
65
Step-by-step explanation:
The sum of interior angles in a triangle is equal to 180
one of the angle is given as 50 degrees so:
50 + x + x = 180
50 + 2x = 180 subtract 50 from both sides
2x = 130 divide both sides by 2
x = 65
Answer:
Always
Step-by-step explanation:
Subtracting a from both sides yields b>0, which is always true since b is a positive integer.
Answer:
10
Step-by-step explanation:
GIVEN: Josiah is playing a computer game that lets him customize a story There are
different eras and
location to choose from.
TO FIND: How many different stories can Josiah construct.
SOLUTION:
Total different eras 
Total different locations 
He can choose one era and one location.
Total different stories that Josiah can construct 

Hence Josiah can construct 10 different stories.