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Quadratic

If the roots x1x1 and x2x2 are the roots of the quadratic equation x2−2x+c=0x2−2x+c=0 also satisfy the equation 7x2–4x1=477x2–4x1=47, then which of the following is true? A c = –15 B x1=−5x1=−5 and x2=3x2=3 C x1=4.5x1=4.5 and x2=−2.5x2=−2.5 D None of these .

Four parts of the grammatically incorrect sentence are given as options below, find the part of the sentence which is grammatically incorrect?
A
Having always been an early riser,

B
waking up early and

C
going for a jog

D
has always been very important to me

Answer provided is D..the reason stated was that as there are two actions being described, we need to use have.But if both actions are considered as a single idea and one complete action, isn't 'has' correct?
the sentence could be re framed as Being an early riser, waking up early and going for a jog has always been very important to me.
Is there anything wrong in this construction?

hello,I wanted to know will the calculator be provided like what 2015 had.
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8093980207

2016 people standing in a circle in an order 1 to 2016. No.1 has a sword. He kills next person (i.e. no. 2) and gives sword to next to next (i.e no.3). All person does the same until only 1 survives. Which number survives at the last?

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1+(4/7)+(9/7^2)+(16/7^3)+(25/7^4)+•••••••

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