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Taya2010 [7]
3 years ago
7

Can someone please help meee!???

Mathematics
1 answer:
lora16 [44]3 years ago
5 0
The answer is the first one <3
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Which expresses 2.7 billion in scientific notation
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Find the quadratic equation whose roots are -3 and 1​
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Answer:

x²+2x-3=0

According to Vieta's formula:

x²-(Sum of roots)x+(product of roots)=0

Sum of roots=-3+1=-2

Product of roots=-3×1=-3

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On a piece of paper, use a protractor and a ruler to construct △ABC with AB=4 in., AC=4 in., and m∠A=60°.
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Answer:

BC 4 in

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The steps for construction;

  • Using a ruler draw line AB 4 inches  and label the end points A and B
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From calculation, length BC can be found by the formula;

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BC=\sqrt{4^2+4^2-2*4*4*cos60}

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2 years ago
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