Question

Need help with 6 and 7

Answer 1

Answer:

part 7 = 15cm

Step-by-step explanation:

$x {}^{2} = (12) {}^{2} + (9) {}^{2} \\ x {}^{2} = 144 + 81 \\ x {}^{2} = 225 \\ x = \sqrt{225} = 15$