A number, x ,is rounded to 2 significant figures is 1300
write down the error interval for x.

Can someone me with these two circle theorem questions asap?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

The amount cami raised during last year’s charity walk, $45.50, is 7/10 of the amount she raised this year. which equation represents n, the number of dollars she raised this year?