Evaluate 10Σi=1 (4i2 -5)

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

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

Define multiplicative inverse. give an example of a number and its multiplicative inverse.