1. Simplify (x2 + 3) - (4x2 – 7)

Can someone answer these problems for me

Find the solution set of this inequality. enter your answer in interval notation using grouping symbols. |8x-4| ≤ 12

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