Acommodities trader bought 4/17 tons of oolong tea and 2/17 tons of green tea to sell to a national supermarket chain how many tons of tea were purchased

6/17

Oolong tea and green tea are both tea so we just have to add 4/17 and 2/17 to get the total number of tons of tea purchased.  

Since the denominators or bottom numbers (17) are already the same, we just have to add the top numbers and put over the denominator.  

4/17+2/17=6/17

his wha5

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.