With an average acceleration of −1.3 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.0 m/s to a complete stop?
answer in units of s.

13.0÷1.69
= seconds for the cyclist to completely stop

first solve -1.3 to the second power or -1.3 squared by multiplying -1.3 by itself
((-1.3)×(-1.3 )=1.69)
then divide 13 by 1.69
we are dividing because we are solving a deceleration equation and by multiplying 2 negatives the sum will always equal a positive and if we multiplied 13 by 1.69 we would turn this into an accelleration equation.

so divide 13 by 1.69
(13÷1.69=7.6923076923)