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yanalaym [24]
3 years ago
5

Plssssssssssssshelppppopppppp

Mathematics
2 answers:
sergeinik [125]3 years ago
8 0
I think it would be 30 dollars and I am 99% positive on that answer I hope this helped
valina [46]3 years ago
3 0

Step-by-step explanation:

1/2·x + 10 ≥ 40

1/2·x ≥ 30

x ≥ 60

There was at least $60 on the gift card.


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Ksju [112]
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t= \frac{-bplus minus \sqrt{ b^{2}-4ac } }{2a}
You might recall seeing this as "x=..." but since our equation is in terms of t we use "t-=..."

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b = the coefficient of t = -60
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t= \frac{60plus minus \sqrt{3152 } }{32}

As we have "plus minus" (this is usually written in symbols with a plus sign over a minus sign) we split the equation in two and obtain:
t=  \frac{60+56.1426}{32} =3.63
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t=  \frac{60-56.1426}{32} =.12

So the height is 8 feet at t = 3.63 and t=.12

It should make sense that there are two times. The ball goes up, reaches it's highest height and then comes back down. As such the height will be 8 at some point on the way up and also at some point on the way down.


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