I'm very confused on these questions, if someone could that would be greatly appreciated.

a. if ab is 20 and bc is 21, based only on the appearance of the figure, what is a good estimate for the length of ac? how do you know?

b. if the actual length of ac is exactly what you computed in part a above, what is the measure of angle abc? how do you know?

c. given the information from a and b above, if ae is 10 and a. f is half of ac, what is the special name for segment ef as it relates to triangle abc?

d. given the result from c above, if the measure of angle efb is 43.6°, what is the measure of angle fbc? how do you know?

e. if triangle dcb is congruent to triangle abc, what kind of shape is abcd? how do you know?

() (98 points)to be fair, you have to have a very high iq to understant the jokes in rick and morty. the humour is extremely subtle, and without a solid grasp of theoretical physics most of the jokes will go over a typical viewer's head. there's also rick's nihilistic outlook, which is deftly woven into his characterisation- his personal philosophy draws heavily from narodnaya volya literature, for instance. the fans understand this stuff; they have the intellectual capacity to truly appreciate the depths of these jokes, to realise that they're not just funny- they say something deep about life. as a consequence people who dislike rick & morty truly are idiots- of course they wouldn't appreciate, for instance, the humour in rick's existential catchphrase "wubba lubba dub dub," which itself is a cryptic reference to turgenev's russian epic fathers and sons. i'm smirking right now just imagining one of those addlepated simpletons scratching their heads in confusion as dan harmon's genius wit unfolds itself on their television screens. what fools.. how i pity them. and yes, by the way, i do have a rick & morty tattoo. and no, you cannot see it. it's for the ladies' eyes only- and even then they have to demonstrate that they're within 5 iq points of my own (preferably lower) beforehand. nothin personnel kid

Daniel expanded the expression as shown below -2(-8x-4y+3/4)=-10x-8y-11/4 what errors did he make? check all that apply

Solve for n? [tex]z = \frac{3}{4} mn[/tex]