cheaterman9926 cheaterman9926 24-05-2024 Mathematics Answered Using the data in RDCHEM.RAW, the following equation was obtained by OLS: rdintens = 2.613 +.00030 sales - .0000000070 sales² (.429) (.00014) (0000000037) n 32, R² = .1484. At what point does the marginal effect of sales on rdintens become negative?