21. MODELING WITH MATHEMATICS The value
mountain bike v (in dollars) can be approximated
the model v = 200(0.75), where t is the number of
vears since the bike was new. (See Example 2.)
a. Tell whether the model represents exponential
growth or exponential decay.
b. Identify the annual percent increase or decrease in
the value of the bike.
c. Estimate when the value of the bike will be $50.

Ineed asap. 35 points. in order for two polygons to be similar, two conditions must be met. first, all pairs of corresponding sides must be in proportion. second, all corresponding angles must be congruent. prove that angle congruence is not enough, by itself, to establish that two polygons are similar. do this by describing or drawing two polygons that are not similar but whose corresponding angles are all congruent.