when i try to change the spund on my mac book air it has a circle with a line though it how can i fix it

Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.

Turn on your Mac and immediately press and hold Command (⌘) and R to start up from macOS Recovery.  

While in macOS Recovery, use Disk Utility to repair your startup disk.

If Disk Utility found no errors or repaired all errors, take either of these actions:

Reinstall macOS

Restore from a Time Machine backup

If you still need help, please contact Apple Support.

plz mark brainliest

some have built technology like spoofed call blockers into their networks, so there's nothing you would even have to install.

this happens because the number is known for scamming, they don't want it to me known as "scam likely." perhaps it's just a telemarketer. maybe it's an identity thief. it might even be a scam artist.  

either way, "scam likely" is probably not an old friend whose number you forgot that you saved. it's your wireless carrier's way of letting you know: answer at your own risk.

explanation:

to combat the seemingly rising epidemic of spam callers in the u.s., the nation's four major wireless carriers have been trying out new methods to reduce the number of unsolicited calls americans receive each day.

some have built technology like spoofed call blockers into their networks, so there's nothing you would even have to install.

hope this . mark me brainliest.

answer; geometric center line;