2x373 because 2 and 373 are both prime meaning they can only be divided by one and themselves
This is impossible to answer. This all depends on what you define as a 'person.' If you are talking about the first Homo Sapiens, then that would be around 2 million years ago, but the predecessors of Homo sapiens could also be considered 'people,' so then you'd have to determine at what point they came into existence.
For system to have infinite solutions, both equation must be similar.
Noticed that second is the first equation times 3:
3[ 2x - 4y = 18]
6x - 12y = 54
So you should fill in 12 in box.
Based on the CPI, the expected price is
$12.75 * 193/100 = $24.61
The actual price is $28.50 -24.61 = $3.89 more than expected. The appropriate choice is ...
b. The actual price is $3.89 higher than the expected price.