Once you're able to get back into your account, review How to help keep your Microsoft account safe and secure. Here you'll find guidance for how to secure your account going forward, make it easier to reset a password, and provide additional methods you can use to verify your account.

Select Start > Settings > System > Sound. In Input, select a microphone to see its properties. In Input volume, make sure the blue bar adjusts as you speak into the microphone. If it doesn't, go to Test your microphone and Start test. This will help you troubleshoot any issues with your microphone.

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How to use the SUMPRODUCT function in Excel, one of Excel’s math and trig functions, using multiplication, addition, subtraction, and/or division to return the sum of the products of corresponding ranges or arrays.