If a car goes along a straight road heading east and speeds up from 45ft/s to 60ft/s in 5 s, calculate the acceleration

You can solve this using the equation v=v[subscript i] + at, where v is the final velocity, v with the subscript the initial velocity, a as the acceleration, and t as the time. Therefore, 60=45+a(5). Solving this algebraically yields 3ft/s. 

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.