Why i'm failing with this in quiz?

I got 20 out of 100 because the square root sign is written as x square root in my iphone 4 calculator and should i have to multiply [6(9653)2] * [6(141.25)-(22.5)2 or divide plus or minusWhy im failing with this in quiz - 1 Added (1). There no sigma in my freaking calculator!

Why doesn't AT&T and Verizon have unlimited data?

I have the iPhone 5s for sprint. Awesome phone but omg sprint is awful. Never get good signal anywhere, and whenever I go to someone's house that's in a wooded area I have no bars. Yet my friends who have Verizon and AT&T are getting perfect signal. 2 things are stopping me from switching: 1) I'm in a family plan, so if I switch I would pay my Own cell bill but I'm only 18 so I don't have too much money. 2) AT&T and Verizon for some reason don't have unlimited data? Why is that? That's the one thing I would love to know is why don't they have unlimited data? They used to I know that, but not anymore. And I don't know any many GB I would need a month for my phone. I'm on Wi-Fi a lot but when I'm out at work or wherever I use my phone for twitter, Instagram and maybe YouTube and the internet. That's it. I don't stream movies videos music etc. So could someone tell me why they don't have unlimited and how many GB I should get a month?

How to know if my iPhone 5s has a virus?

I was using the google chrome app and i clicked on this website and i closed it later. The website looked pretty suspicious. When I tried to go on some specific websites it would be very slow! But it was normal speed for other websites. I found that weird so I deleted the app and downloaded back. Now its normal speed on my specific websites and other sites, but I'm still a bit concerned that my 5s has a virus on it. Is there ways to tell? Or do iphones don't get viruses? Answer if you know it for a fact.

Will it be hard to do playthroughs with these pokemon teams?

I got pokemon for my iphone, I'm not serious about playing it through it ( since I actually have a life now), but I've organized my teams:

My "hippy" team consists of pokemon I feel a hippy, indie person, or stoner would own( their designs)

Xatu
Umbreon
Solrock
Milotic
Snorunt
Armaldo

This is a team of pokemon I think look the coolest that I'll be using for fire red-emerald playthroughs

Charizard
Gyrados
Umbreon
Sharpedo
Salamence
Metagross

And my last team is pokemon is also based on pokemon I think look the coolest.I'll be using for the platinum- x&y hacks I have.

Charizard
Sharpedo
Metagross
Scolipede
Hydreigon
Pangoro