Why are GDP, Inflation Rate, and Unemployment Rate used to measure a country's economic performance?

3. solve by graphing: y = 2x + 6 x + y = -3

Afarmer sells 9.5 kilograms of apples and pears at the farmer's market. 4/5 of the weight is the apples and the rest is the pears. how many kilograms of pears did she sell at the farmers market

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)