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Minchanka [31]
3 years ago
7

Round 342.79513 to the three significant figures

Mathematics
1 answer:
Pavel [41]3 years ago
6 0

Answer:

343

Step-by-step explanation:

Because the 5 rounds 9 to a 10, making the 7 an 8, hence:

342.8

round the 2 to a 3 because the 8 round it up, making it 343

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A number decreased by 15 is less than 35. What numbers satisfy this condition?
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shasta claimed that the equation x^2+25=0 can be solved by using its factored form of (x+5i)^2=0, and that -5i is the only zero
Elanso [62]

Answer:

The given equation will have two roots as +5i and -5i

Step-by-step explanation:

Shasta claimed that the equation x^2+25=0 can be solved by using its factored form of (x+5i)^2=0, and that -5i is the only zero for this function

The given equation is x^2+25 =0

This clearly shows it will have complex roots, and since it is a quadratic equation it will have 2 complex roots

x^2 = -25 \\x = \sqrt{-25} \\x= \sqrt{-1}* \sqrt{25}\\

x = i\sqrt{25}

x = ± 5i

It will be false to say that -5i will be the only complex root to this equation.

The given equation will have +5i and -5i as its roots.

Lets verify

x = +5i

(5i)^2 + 25 \\25i^2 + 25 \\25(-1) + 25\\-25 + 25 = 0

x = -5i

(-5i)^2 + 25 \\25i^2 + 25 \\25(-1) + 25 \\-25 + 25 \\ = 0

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3 years ago
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