Estimate. then use the break apart strategy to find the sum

Which best describes the function on the graph? direct variation; k = −2 direct variation; k = -1/2 inverse variation; k = −2 inverse variation; k = -1/2

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

Julia bought 7 hats a week later half of all her hats were destroyed in a fire. there are now only 12 hats left with how many did she start