Find the simple interest on $1,975 for 3 1/2 years at a rate of 7.2% per year

Ageologist had two rocks on a scale that weighed 4.6 kilograms together. rock a was 0.5 of the total weight. how much did rock a weigh?

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

Graph the equationy= x+3[tex]y = x + 3[/tex]