Answer:
7000 meters
Step-by-step explanation:
We know that 1 km = 1000 meters
7 km * 1000m/km = 7000 meters
c = unknown
a = 4c
120 = 2a + 2c
120 = 2(4c) + 2c
120 = 8c + 2c
120 = 10c
120/10 = 10c/10
c = 12
$10 per kilogram
To eliminate the decimals,multiply everything by 10
0.4.........4
4.00.........40
4 kilos = $40
1 kilo = $10 (40/4)