Express the vector r~ a b c d p r in terms of a~ , b~ , c~ , and d~ , the edges of a parallelogram. 1. r~ = c~ + d~ 2. r~ = a~ − b~ 3. r~ = a~ − c~ 4. r~ = a~ + d~ 5. r~ = b~ + d~ 6. r~ = b~ − a~ 7. r~ = a~ − d~ 8. r~ = b~ + a~ 9. r~ = d~ − a~ 10. r~ = c~ + b

where is the circuit diagram ?

a=d/t

a="triangle"v/t

explanation:

a = acceleration

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.