Question

Check my work plz :)

Answer 1

i got...
a=4
b=3
c=5 (used PT)
a'=-.1
b'=.2
plugged all those into aa' + bb' = cc' (derivation of PT)
and got c' = .04 meters per minute

Answer 2

\(a^2 + b^2 = c^2\)

\(\implies 2a a' + 2bb' = 2cc' \)

Answer 3

@Jgeurts you are correct!

Answer 4

thank you! @rational i just cancelled the 2's

Answer 5

@yttrium thank you