Late fee for Best Buy credit card?

I bought an iPhone 7plus recently. I knew today was my due date & it says it won't charge a late fee unless you pay after 5pm. I forgot my card at home, I'm at work right now. How much is the late fee?

Ohms law, V will be 120volts, I is 5 +- 0.1amp. What interval does R have to lie for I to be within 0.1amp of value Io =5?

Ohms law, V will be 120volts, I is 5 +- 0.1amp. What interval does R have to lie for I to be within 0.1amp of value Io =5?

Added (1). Having trouble understanding. Could anyone help me out with this?

Added (2). Having some trouble on highschool calc hhomework. Could anyone help me? Your firm has been asked to supply the resistors for a circuit in which v will be 120 volts and I is to be 5 +or- 0.1 amp. In what interval does R have to lie for I to be within 0.1 amp of the value Io = 5…

Io is meant to be the I interval with a subscript of 0.

Iphone 6s microphone problems?

IPhone 6s running ios 10.3.2. Microphone works (no mechanical errors) as I can record videos with sound. I can record both front facing and rear facing videos with sound. However, siri and voice detection do not detect any sound and some apps do not either
example: snapchat
I can record videos etc and the microphone works fine both front facing and rear facing. However when using the video call function, the other person can't hear any sound and they have their volume/ not muted etc.
Why is this and is there any fixes? I do not want to go to the apple store as they always advise to either replace the phone(buy a new one) which I do not want to do