What volume of 6.00 M nitric acid is needed to prepare 250. mL of 0.750 M nitric acid?
How many moles HNO3 do you need? That is M x L = moles.
Then M HNO3 = moles/L soln
You know M (6.00M) and moles(from above), solve for L soln and convert to mL.
Then M HNO3 = moles/L soln
You know M (6.00M) and moles(from above), solve for L soln and convert to mL.