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Stells [14]
2 years ago
13

Determine the value of 217

Mathematics
1 answer:
BlackZzzverrR [31]2 years ago
4 0
The answer in decimal form should be 5.3 if you round it up
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PLEASE HELP ILL GIVE BRAINLIEST
dusya [7]

1)

(-2+\sqrt{-5})^2\implies (-2+\sqrt{-1\cdot 5})^2\implies (-2+\sqrt{-1}\sqrt{5})^2\implies (-2+i\sqrt{5})^2 \\\\\\ (-2+i\sqrt{5})(-2+i\sqrt{5})\implies +4-2i\sqrt{5}-2i\sqrt{5}+(i\sqrt{5})^2 \\\\\\ 4-4i\sqrt{5}+[i^2(\sqrt{5})^2]\implies 4-4i\sqrt{5}+[-1\cdot 5] \\\\\\ 4-4i\sqrt{5}-5\implies -1-4i\sqrt{5}

3)

let's recall that the conjugate of any pair a + b is simply the same pair with a different sign, namely a - b and the reverse is also true, let's also recall that i² = -1.

\cfrac{6-7i}{1-2i}\implies \stackrel{\textit{multiplying both sides by the denominator's conjugate}}{\cfrac{6-7i}{1-2i}\cdot \cfrac{1+2i}{1+2i}\implies \cfrac{(6-7i)(1+2i)}{\underset{\textit{difference of squares}}{(1-2i)(1+2i)}}} \\\\\\ \cfrac{(6-7i)(1+2i)}{1^2-(2i)^2}\implies \cfrac{6-12i-7i-14i^2}{1-(2^2i^2)}\implies \cfrac{6-19i-14(-1)}{1-[4(-1)]} \\\\\\ \cfrac{6-19i+14}{1-(-4)}\implies \cfrac{20-19i}{1+4}\implies \cfrac{20-19i}{5}\implies \cfrac{20}{5}-\cfrac{19i}{5}\implies 4-\cfrac{19i}{5}

7 0
2 years ago
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The median is 19.5. 16+23 is 39. 39/2 is 19.5
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Which statement describes the congruent triangles?
Lemur [1.5K]

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A) WXZ=YZX

Step-by-step explanation:

WXZ=YZK

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If I was making cupcakes and brownies for my school fundraiser and the brownies needed 1.28cups of sugar and the cupcakes needed
xxMikexx [17]
You need A lot of sugar
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Write the ratio of the first measurement to the second measurement. Compare in inches.
GarryVolchara [31]

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60 in:9 in   20 in:3 in    6.6666667

Step-by-step explanation:

5 ft needs to be in inches, so multiply by 12 (inches per foot) ten you can compare.

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