3x+5=5x-3 I know this is not related

So I don't know what happend to my other account but I made a new one...

Also who wanna write a song with be... kinda of bored...

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?