- CHEMISTRY HELP PLEASE!!!!!!!!! 10 POINTS!!! :)?

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If a cars speed is 60 kilometers/hour and it travels for 250 kilometers, how long did it take the car to travel that far? Calculate Kcat and catalytic efficiency given Vmax of 4200µM∙min-1 &kinetic assay, 0.2mL of a 0.15mg/mL solution of enzyme (90,000 g/mole)? Explain elements compounds and mixtures with nuts, bolts and washers? Explain and give examples of mitosis, variation, alletes, crosses, selection and evolution? Find the amplitude, phase shift, and period of the function y=1-(1/2)cos(2x+pi/2)
i have no idea how to solve it, please Help!?