Answer:
a = 5
Step-by-step explanation:
a +a+4 + 2a-3 = 21
4a +1 =21
4a = 20
a = 5
Answer:
6m
Step-by-step explanation:
Humans (biosphere) harness energy from the water (hydrosphere) by having it spin turbines (lithosphere) to produce electricity.
The answer is true. Proportionality means “having a constant ratio to another quantity”
The answer is 8.2 hope u pass on whatever you are doing