I popped in the values to desmos, and it doesnt make a line. i dont think it is a proportional relationship... either that or im dumb lol sorry
QR. because if BCDE is congruent to OPQR then the sides and angles will be the same also by either sss, sas, asa, or aas depending on how the shape is.
Answer:
what I got was 24438.9cm³
The expression defines the given series for seven terms, i don't understand the question but i do know the sum which you should know to
15 + 19 + 23 = 57
Sorry