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!

Try both and see which one give you the right result…

Thank you i just repeat it fro the 3 time and i passed i got 65/100

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