Pls help me with this

Mathematics

2 answers:

USPshnik [31]2 years ago

8 0

Answer:

D at 8.8

im not sure brainliest please ok

8_murik_8 [283]2 years ago

7 0

Answer:

The answer is C at 8.1.

Step-by-step explanation:

To find $\sqrt{66}$ , start by finding the two consecutive perfect squares that 66 lies between them. The two perfect squares are 64 ( $8^{2}$ ) and 81 ( $9^{2}$ ). So, the whole number part of the square root of 66 will be 8.

Now, for the decimal part, use the following formula:

(Given number - Smaller perfect square) / (Greater perfect square - Smaller perfect square)

Then, put in the known information, which will look like:

(66 - 64)/(81 - 64) = 2/17 = 0.117

Finally, $\sqrt{66}$ is 8.117, so the answer is C at 8.1.

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Plzzzzzzzz! A suitcase lock has a code 4 symbols long. The symbols on the lock are a star, a square, a circle, a triangle, a lin

34kurt

Answer:

$\dfrac{1}{30}$

Step-by-step explanation:

6 symbols and 4-symbol code so number of combinations wich doesn't contain the same symbol twice would be:

6•5•4•3 = 360

If code starts with a star followed by triangle that means only one posibility for first two symbols and code doesn't containing the same symbol twice means that left 4 symbols for next two.

So number of combinations of code starting with a star followed by triangle and doesn't containing the same symbol twice will be:

1•1•4•3 = 12

The probability that a randomly chosen code starts with a star followed by triangle and doesn't contain the same symbol twice:

$\dfrac{1\cdot1\cdot4\cdot3}{6\cdot5\cdot4\cdot3}=\dfrac{1\cdot1}{6\cdot5}=\dfrac{1}{30}$