Question

What is the length of the side marked x to the nearest tenth? (giving brainliest and thanks to all!)

Answer 1

Answer:

Step-by-step explanation:

pythagors theorem

a^2+b^2=c^2

15^2+x^2=21^2

225+x^2=441

x^2=441-225

x=$\sqrt{216$

x=6$\sqrt{6$

=14.69

x=14.7 km