- 1/2(30x+29)?

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How often are rain forecasts at least 6 or 7 days in advance ever correct? Write and balance the equation for the complete combustion of ethane, C2H6. You do not need to include any phase symbols or energy changes.? Calculate the de Broglie wavelength of a 143-g baseball traveling at 89 mph.? In the x column, begin at -2, increment by 1 and finish at 2 (41 rows).In the y column, use above formula, referencing appropriate x-value.? Please Help!!
What is the mass (in grams) of 9.42 × 1024 molecules of methanol (CH3OH)?