Set costs $30 before a 30% discount

$39

Step-by-step explanation:

Set costs $21 after discount

Step-by-step explanation:

$30 = 100%

$x = 100% - 30% = 70%

70% = 0.7

30(0.7) = 21

$21

If my answer is incorrect, pls correct me!

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-Chetan K

yes

step-by-step explanation:

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.