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Stels [109]
2 years ago
8

Pls send the answer ​

Mathematics
1 answer:
luda_lava [24]2 years ago
4 0

Answer:

a = \dfrac{46}{17}

b = 0

Step-by-step explanation:

\dfrac{2\sqrt{5} + \sqrt{3}}{2\sqrt{5} - \sqrt{3}} + \dfrac{2\sqrt{5} - \sqrt{3}}{2\sqrt{5} + \sqrt{3}} =

= \dfrac{2\sqrt{5} + \sqrt{3}}{2\sqrt{5} - \sqrt{3}} \times \dfrac{2\sqrt{5} + \sqrt{3}}{2\sqrt{5} + \sqrt{3}} + \dfrac{2\sqrt{5} - \sqrt{3}}{2\sqrt{5} + \sqrt{3}} \times \dfrac{2\sqrt{5} - \sqrt{3}}{2\sqrt{5} - \sqrt{3}}

= \dfrac{23 + 4\sqrt{15}}{17} + \dfrac{23 - 4\sqrt{15}}{17}

= \dfrac{46}{17}

a = \dfrac{46}{17}

b = 0

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Which number produces a rational number when multiplied by 0.5?
xxMikexx [17]

If the number begins by being rational, multiplying by 0.5 will not change whether or not it is rational. It will remain rational.


That would include any even number 12 * 0.5 = 6

12 started out as rational, so the answer is rational (6)


Any odd number is also rational

23 * 0.5 = 11.5

23 and 11.5 are both rational.


3.636363636 ... is rational so when multiplied by 0.5 the result will be rational.

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then pi * 0.5 is not rational.

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2 years ago
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What is the value of c?<br> 14 = - 2c - 6 - 3c
Neporo4naja [7]

Answer:

c = -4

Step-by-step explanation:

Step 1: Write equation

14 = -2c - 6 - 3c

Step 2: Solve for <em>c</em>

  1. Combine like terms: 14 = -5c - 6
  2. Add 6 on both sides: 20 = -5c
  3. Divide both sides by -5: c = -4

Step 3: Check

<em>Plug in c to verify it's a solution.</em>

14 = -2(-4) - 6 - 3(-4)

14 = 8 - 6 + 12

14 = 2 + 12

14 = 14

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3 years ago
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78% of 50 points = 0.78 x 50 
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Answer: The student needs to score 35 points.
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