(x+4) , (x+12) ,(x-1) and(x+5) are in proportion. find the value of x

(1) which phrase describes an important agricultural change that occurred during the mississippian period? (a) first cultivation of wild grains (b) expansion of marsh elder farming (c) spread of corn agriculture (d) gathering of nuts and berries (2) which group of native americans use northwestern arkansas as it’s traditional hunting grounds? (a) osage (b) quapaw (c) woodland (d) caddo

How do convection currents form underwater mountains?

Why is terracing used in southeast asian agriculture?