Carol used 1.8 gallons of paint for barn. she used 1/5 of the remaining paint for a dog house. she had 2/7 of the paint left. how much painted carol begin with?

Asap! i'm not good math and i'm lost.

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?