3 years ago

Evaluate arccos (-1/2)

Mathematics

1 answer:

Crazy boy [7]3 years ago

3 0

Answer:

120 degrees

Step-by-step explanation:

plugged into calculator

cos inverse of -1/2

Please mark Brainliest if you feel like it:)

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3/4(8x + 20) - 4x > -11

den301095 [7]

In this case, we'll have to carry out several steps to find the solution.

Step 01:

Data

3/4(8x + 20) - 4x > -11

x ==> ?

Step 02:

Inequality :

$\begin{gathered} \frac{3}{4}\cdot(8x\text{ + 20) - 4x > -11} \\ 6x\text{ + }15\text{ -4x > -11} \end{gathered}$

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2x + 15 - 15 > -11 - 15

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2x / 2 > -26 / 2

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The answer is:

x > -13

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1 year ago

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Paladinen [302]

19 is a prime number, so the prime factorization is 1*19

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3 years ago

Two taps A and B fill a swimming pool together in two hours. Alone, it takes tap A three hours less than B to fill the same pool

Ira Lisetskai [31]

Let's call $a$ the number of hours it takes for A to fill the pool and $b$ the number of hours it takes for B to fill the pool.

We have $a=b-3$ and $\frac{2}a+\frac{2}b=1$ hence $\frac{2}{b-3}+\frac{2}b=1\Leftrightarrow b^2-7b+6=0\Leftrightarrow b=6\text{ or }b=-1$ hence $b=6$ and thus $a=3$ .

$\boxed{b=6,a=3}$

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Read 2 more answers

Please help me with this question

noname [10]

Answer:

arrow A

Step-by-step explanation:

6 out of 30 or 1/5 which is arrow A

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I will make you brainlliest whoever answers this right and will give you points Please help me i am having a hard time