2,2.06,2.7
Look at this
This is the reason
2, 2.06, 2.70
45 handshakes would take place! i've attached how i figured this out (pardon the scribbles)
45 tickets for 27$is definitely the best deal because if you go with the first option and buy it twice you will pay 25$for only 40 I can’t Explain properly but definitely 45 for 26$
answer: D = 1
Isolate the variable by dividing each side by factors that don't contain the variable. 7 (2d - 1) + 5 (2 - 3d) = 2d
Note that

in the given closed interval, so the area is exactly given by the definite integral

(no absolute values needed!)
Integrating gives