Ineed to know how to round to the nearest hundredth in the number 1.120

I thk its 19.01 im not sure

So in the number 1.120, the number on the left side of the decimal is the whole number. the numbers on the right side of the decimal are called decimals. The first decimal is the tenth place. The number to the right of that is the hundredth place. The last number, the 0, is the thousandth place. You round up or down in the thousandth place. 5 or up goes to lets say 6 in the number 2.345. If it is 4 or lower, you round down so the number would stay the same. 

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats