Let A represent the amount Ann contributed, Z represent Zoe's contribution, and J represent Jim's contribution toward the present.
Ann (A): A
Zoe (Z): A = Z - 12 → Z = 12 + A
Jim (J): A = J - 16 → J = 16 + A
A + Z + J = 154
(A) + (12 + A) + (16 + A) = 154
3A + 28 = 154
3A = 126
A = 42
Ann (A): A = 42
Zoe (Z): Z = 12 + A = 12 + 42 = 54
Jim (J): J = 16 + A = 16 + 42 = 58
Answer: Ann=42, Zoe=54, Jim=58
Answer:
80
Step-by-step explanation:
To find the mean we add up all the numbers and then divide that number by the amount of numbers we added up.
So in this case we added up 65, 70, 75, 80, 85, 90 & 95. This gives us 560. Now we divide 560 by 7 as that is the amount of numbers we added up. This gives us 80 which means the answer is 80.
I hope this helped! :)
Answer:
Distributive Property
Step-by-step explanation:
"The multiplication of a number by a sum is equal to the sum of the multiplications of this number by each one of the amounts to be added."
Answer: 
The interval in which the average is likely to fall : 
Step-by-step explanation:
Given : A poll found that a particular group of people read an average of 12.8 books per year.
The pollsters are 99% confident that the result from this poll is off by fewer than 3.93 books from the actual average x.
The inequality to express this situation involving absolute value will be :-
Hence, the interval in which the average is likely to fall :
y = x² + 3x - 7
3x - y = -2
3x - y = -2
- 3x - 3x
-y = -3x - 2
y = 3x + 2
x² + 3x - 7 = 3x + 2
- 3x - 3x
x² - 7 = 2
+ 7 + 7
x² = 9
x = ±3
The solutions to the following system of equations is ±3.
