Fine the surface area of this triangular prism

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?