First we define variables:
x = first card original value
y = second card original value
z = third card original value
We write the system of equations:
Andrew bought 3 baseball cards for $ 240:
x + y + z = 240
the first card (at its original value) along with the second card (at its original price) and got $ 320:
2x + y = 320
the first card (at its original value) card along with the third card (at its original price) would have only got him $ 280:
2x + z = 280
Solving the system we have:
x = 120
y = 80
z = 40
Answer:
The original prices for each of the 3 baseball cards is:
(120, 80, 40)
Answer: 13
Step-by-step explanation:
2x-27=-1
2x=26
X=13
Answer:
or 
Step-by-step explanation:
We complete the square as follows
Group the constant term on the right hand side
Divide through by 2,
Add half the square of the coefficient of x to get;
Simplify to get
Take the square root of both sides to get
Solve for x
or
Step-by-step explanation:
1. x>50
2. (5x+2x)<70
3 (4x-6)>54
Answer:
option number a -4 and -9
