Answer:
c
Step-by-step explanation:
7(-3)+9(2)>-3
-21+18>-3
-3>-3
No
Answer:
Step-by-step explanation:
dy/dx = 2x +4 = 2*1 +4 = 6
Let the price of the 3rd card be c. Now we can write the equation:
c + (c + 20) + (c + c + 20) = 160 .........(1)
Simplifying the left hand side of equation (1), we get:
4c + 40 = 160 .........(2)
Subtracting 40 from both sides of equation (2) gives:
4c = 120
from which c = $30.
Therefore the price of the second card = 30 + 20 = $50
and the price of the first card = 30 + 50 = $80.
