Margot is studying the yield of bushels of wheat in comparison to the amount of rainfall, in inches, that occurs. she finds the linear regression equation to be y = 47.3 +0.78x. what does 47.3 mean in the context of the problem?

It means that if there is no rain or very little rain, then there will be about 47.3 bushels of wheat.
hope this . 

143 hamburgers and 429 cheese burgers

Explanation:

Call h and c the number of both items.
(h-hamburger and c-cheeseburger)

h + c = 572
c = 3h

Sub the second into the first

h + 3h = 572
4h = 572

Divide both sides by 4
h = 143 hamburgers

Use this back into the second equation
c = 3 • 143 = 429 cheeseburgers