What is 4,500,000 expressed in scientific notation

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2

What the heck i didn’t know

1+1=22×1=22-1=11-1=1duh