D I hope this really helps a lot
Answer:
231
Step-by-step explanation:
7x21=147
6x17=102
147+102=249
249-18=231
Answer: Letter D 7x21+6x17-18
Bye yw!
Let

Then




As
, the exponential term will converge to zero, so the infinite sum converges to

5x70=5x7tens.
60x4=6tensx4.
7x30=7x3tens.
90x3=9tensx3.
5 Is the square root of 125