Answer:
2/5
Step-by-step explanation:
Answer:D
Step-by-step explanation:
This is the concept of arithmetic. To calculate the percentage of time life has existed we proceed as follows;
According to history:
The age of earth is 4.6 billion years
the age of life is as it appeared from unicellular is 3.8 billion years.
thus the percentage of the above will be:
3.8/4.6 x 100
=0.82609x100
=82.609%
Assuming h stands for hamburgers and s stands for chicken sandwiches, then we can represent the statement like so:
Using Elimination method:
Multiply the first equation by 8 and multiply
the second equation by 4
Simplify
Subtract equation 2 from 1
Simplify further by dividing both sides by the coefficient of s
Substitute for s in equation 1
Collect like terms
Hence, the cost of hamburgers is $2.5 and chicken sandwiches is $3.5