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3 years ago

For which of the following compound inequalities is there no solution?

Mathematics

1 answer:

Oksi-84 [34.3K]3 years ago

8 0

Answer:

I don't know how to do it

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Helpppppp mathhhhhhhhhh

Alex Ar [27]

The final answer will be 14.4

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4 years ago

Simplify the following expression and state the excluded values<br><br> m+7/m^2+4m-21

erastova [34]

5m-14/(m+1)(m-1)

excluded values: 1,-1

4 0

3 years ago

Read 2 more answers

What are the orders of 3,7,9,11,13,17 and 19(mod20)?does 20 have primitive roots?

bezimeni [28]

$3\equiv3\mod{20}$
$3^2\equiv9\mod{20}$
$3^3\equiv27\equiv7\mod{20}$
$3^4\equiv3\cdot3^3\equiv3\cdot7\equiv21\equiv1\mod{20}$

$7\equiv7\mod{20}$
$7^2\equiv49\equiv9\mod{20}$
$7^3\equiv7\cdot7^2\equiv63\equiv3\mod{20}$
$7^4\equiv7\cdot7^3\equiv21\equiv1\mod{20}$

$9\equiv9\mod{20}$
$9^2\equiv3^4\equiv1\mod{20}$

$11\equiv11\mod{20}$
$11^2\equiv121\equiv1\mod{20}$

$13\equiv-7\equiv13\mod{20}$
$13^2\equiv169\equiv9\mod{20}$
$13^3\equiv13\cdot13^2\equiv(-7)9\equiv-63\equiv-3\mod{20}$
$13^4\equiv13\cdot13^3\equiv(-7)(-3)\equiv21\equiv1\mod{20}$

$17\equiv-3\equiv17\mod{20}$
$17^2\equiv(-3)^2\equiv9\mod{20}$
$17^3\equiv(-3)^3\equiv-27\equiv3\mod{20}$
$17^4\equiv(-3)^4\equiv81\equiv1\mod{20}$

$19\equiv-1\equiv19\mod{20}$
$19^2\equiv19(-1)\equiv-19\equiv1\mod{20}$

Generally speaking, a number $x$ coprime to $n$ will be a primitive root of $n$ if we have $x^n\equiv x\mod{n}$ , or $x^{n-1}\equiv1\mod{n}$ . In other words, if $x$ is of order $n-1$ modulo $n$ , then $x$ is a primitive root of $n$ .

Since none of these numbers has order 19, it follows that 20 does not have any primitive roots.

6 0

4 years ago

The Kentucky derby distance is 19 furlongs. How far is the Kentucky derby?how many rods

Bumek [7]

Answer:

760 rods.

Step-by-step explanation:

If my memory serves me right there are 4 rods in a chain and 10 chains in a furlong.

So 19 furlongs = 19 * 10 * 4 rods

= 760 rods.

4 0

4 years ago

Bob set his watch 5 seconds behind, and it falls behind another 1 second every day. How

ankoles [38]

Answer:

44 days

Step-by-step explanation:

3 0

3 years ago