HELP PLEASE!!! This question is designed to be answered without a calculator.
The function f(x) = x4 – 32x2 is increasing on the intervals.

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

The function show two sisters' savings account and the rate at which they plan to deposit money

Can someone explain to me how to do