Answer:
D
Step-by-step explanation:
3/7 + 6/7 = 9/7
Change 9/7 to a mixed number = 1 2/7
Add your whole numbers: 1 + 10 + 1 = 12
Answer: 12 2/7
Answer:
The probability that A selects the first red ball is 0.5833.
Step-by-step explanation:
Given : An urn contains 3 red and 7 black balls. Players A and B take turns (A goes first) withdrawing balls from the urn consecutively.
To find : What is the probability that A selects the first red ball?
Solution :
A wins if the first red ball is drawn 1st,3rd,5th or 7th.
A red ball drawn first, there are
places in which the other 2 red balls can be placed.
A red ball drawn third, there are
places in which the other 2 red balls can be placed.
A red ball drawn fifth, there are
places in which the other 2 red balls can be placed.
A red ball drawn seventh, there are
places in which the other 2 red balls can be placed.
The total number of total event is
The probability that A selects the first red ball is




It could be x > 21 im not sure
Answer:
Step-by-step explanation:
The sum of the ages of a Mother and her son is 78 , three years ago the mother is five times as old as the son, what is their present ages?
To solve this , let the age of the mother be x and the age of the son be y , from the first statement :
x + y = 78
Three years ago , the mother will be x- 3 and the son will be y - 3 , from the second statement:
x - 3 = 5 ( y-3)
x- 3 = 5y - 15
x - 5y = -12
The resulting equations are
x + y = 78
x - 5y = -12
This is called a simultaneous linear equation , that means it is a linear equation.
The side of a square is xcm , if the difference between the area and the perimeter is 12 , find the legth of its side.
Interpretation:
The formula for the area of a square is
and the perimeter is 4l , from the question , we have
- 4x = 12
This is not a linear equation , it is simply a quadratic equation , so the situation is non linear