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3 years ago

Write a rational number which has no reciprocal or multiplicative inverse.

Mathematics

1 answer:

Ann [662]3 years ago

5 0

Answer:

Step-by-step explanation:

0 is the only number that has no reciprocal or multiplicative inverse.

A reciprocal / multiplicative inverse of a number means a number that when multiplied by the original number will equate to 1.

However, no matter what you multiply with 0, it will never be 1.

Hence, the answer is 0.

Hope this helped!

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The data given below consists of the number of children with food allergies at a sample of elementary schools: 3, 9, 5, 5, 14, 1

Mice21 [21]

Answer:

z -score = 0.0459

Step-by-step explanation:

Given that:

the number of children with food allergies at a sample of elementary schools: 3, 9, 5, 5, 14, 10, 5, 11, 9, 6, 1, 8, 10, 7, 9, 13, 18, 9, 8, 11, 9, 7, 6, 14, 12.

The objective is to find the z- score , but before we can do that , we need to determine the mean and the standard deviation of the sample.

Mean = sum of the sample/ total number of the sample

Mean = (3+9+ 5+ 5+ 14+ 10+ 5+ 11+ 9+ 6+ 1+ 8+ 10+ 7+ 9+13+ 18+ 9+ 8+11+ 9+ 7+ 6+ 14+ 12)/25

Mean = 219/25

Mean = 8.76

Standard deviation = $\sqrt{\dfrac {\sum (x_i - \mu)^2}{N}}$

Mean (in order )= 1, 3,5,5,5,6,6,7,7,8,8,9,9,9,9,9,10,10,11,11,12,13,14,14,18)

Standard deviation = $\sqrt{\dfrac { (8.76 - 1)^2}{25} + \dfrac { (8.76 - 3)^2}{25} +\dfrac { (8.76 - 5)^2}{25} +...+ \dfrac { (8.76 - 18)^2}{25} }$

Standard deviation = 5.2174

The standard z score formula is:

$z = \dfrac{X- \mu}{\sigma}$

where X = median (13th observation ) = 9

$z = \dfrac{9- 8.76}{5.2174}$

$z = \dfrac{0.24}{5.2174}$

z -score = 0.0459

4 0

3 years ago

Greg and Anna drive uphill from lakeshore to valley view point, and back. Downhill to lakeshore. They notice that the drive uphi

ZanzabumX [31]

If driving uphill takes 10 minutes less than twice to drive downhill, denoting the time to drive downhill with t, driving uphill is going to be 2t-10. By this way, we are going to answer to the first part of the question.

Next, we can write that 2t-10-t=65 and t=75 minutes

And driving uphill takes 2t-10 = 2*75-10 = 140 minutes

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3 years ago

Someone please help me, I’m doing a final right now, and this question so confusing.

Sauron [17]

Answer:

C and D

Step-by-step explanation:

C: (2,0)

D: (0,4)

4 0

3 years ago

Read 2 more answers

The sum of two consecutive odd integers is 156. Which is an equation that can be used to solve for x?

satela [25.4K]

Answer:

Below.

Step-by-step explanation:

We can write an odd integer as 2x + 1 so consecutive odd digits would be 2x + 1 and 2x + 3, so the equation is:

2x + 1 + 2x + 3 = 156

4x + 4 = 156 can be used to solve for x and find the integers.

4x = 152

Dividing through by 4:

x = 152/4 = 38

So the 2 integers are 2(38) + 1 and 2(38) + 3

= 77 and 79.

7 0

4 years ago

Any number that is divisible by 3 also divisible by 6. Find a counterexample to show that the conjecture is false.

Alex_Xolod [135]

Answer:

Any number that is divisible by 3 is also divisible by 6. Find a counterexample to show that the conjecture is false. 24 18 12 21.

Step-by-step explanation:

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3 years ago

Write a rational number which has no reciprocal or multiplicative inverse.​

Write a rational number which has no reciprocal or multiplicative inverse.