Mars is 33.9 million miles from the earth. the apollo 10 spacecraft traveled at speeds of 39,000 km/h. if we traveled using the apollo spacecraft, how many days would it take to reach mars?

We can assume that the Apollo 10 spacecraft traveled at a constant speed and there is no any other force. 

So, then we can use s = ut formula. (Where s is the distance, u is the speed/velocity and t is the time taken).

Before apply the formula make sure that all units are in same measures. If not those units should be converted into one measure.
     Here distance is 33.9 million miles. Speed is given as 39,000 km/h. Use have to take those values into one measure. So let's convert 33.9 million miles into km.
       1 mile               = 1.60934 km
     33.9 million mile = 1.60934 x 33.9 x 10⁶ km
                                 = 54.56 x 10⁶ km

By applying the formula,
54.56 x 10⁶ km = (39,000 km/h) x t
                       t = 1398.97 h
                     
                  day = 24 h
        
                       t = (1398.97 / 24) days
                       t = 58.29 days

Hence, Apollo spacecraft would take 58.29 days to reach Mars.

the correct answer is:

a. formation of precipitation

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.