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3 years ago

Why is 2 + (-3) = -1

Mathematics

1 answer:

Softa [21]3 years ago

4 0

Answer:

Because +- or - + = -

Step-by-step explanation:

-a + b = - c

a + - b = - c

-a × b = - c

a × - b = -c

Extra references:

-ve ×/+ -ve = +ve

+ve ×/+ -ve = - ve

-ve ×/+ +ve = - ve

+ve ×/+ +ve = +ve

Hope these could solve your problem.

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Johnny will work 15 hours a week during the 36 week school year, and 40 hours a

Goryan [66]

The answer is B-5,310

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4 years ago

A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.64 years and the standard deviation i

____ [38]

Answer:

See below for answers and explanations

Step-by-step explanation:

Assuming that conditions have been met for the interval, we use the formula $\displaystyle CI=\bar{x}\pm t\frac{s}{\sqrt{n}}$ where $\bar{x}$ represents the sample mean, $t$ represents the critical value, $s$ represents the sample standard deviation, and $n$ is the sample size.

The critical value of $t$ for an 80% confidence level with degrees of freedom $df=n-1=25-1=24$ is equivalent to $t=1.317836$

Thus, we can compute the confidence interval:

$\displaystyle CI=\bar{x}\pm t\frac{s}{\sqrt{n}}\\\\CI=32.64\pm1.317836\biggr(\frac{9.39}{\sqrt{25}}\biggr)\\\\CI\approx\{30.17,35.11\}$

Therefore, we are 80% confident that the true mean age of all customers is between 30.17 and 35.11 years.

The margin of error is $\displaystyle t\frac{s}{\sqrt{n}}=1.317836\biggr(\frac{9.39}{\sqrt{25}}\biggr)\approx2.47$

6 0

2 years ago

Determine the fraction of total interest owed using the rule of 78. After the six month of a 12 month loan, the numerator is: {(

Dima020 [189]

Answer:

The fraction of total interest owed is $\frac{57}{78}$

The value of it to the nearest tenth is 73.1%

Step-by-step explanation:

Let us solve it using the rule of 78

∵ The loan = 12 month

∵ The numerator is after 6 month

- Substitute n by 1 in each bracket

∴ The numerator = {(1 + 11) + (1 + 10) + (1 + 9) + (1 + 8) + (1 + 7) + (1 + 6)}

∴ The numerator = {12 + 11 + 10 + 9 + 8 + 7}

∴ The numerator = {57}

∴ The numerator of the fraction is 57

∵ The denominator = {(n) + (n + 1) + (n + 2) + .......... + (n + 11)}

- substitute n by 1 in each bracket

∴ The denominator = {1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12}

∴ The denominator = {78}

∴ The denominator of the fraction is 78

The fraction of total interest owed is $\frac{57}{78}$

Now find the value of the fraction

∵ The fraction = $\frac{57}{78}$

∴ Its value = 0.7307692308 × 100%

∴ Its value = 73.07692308%

- Round it to the nearest tenth

∴ Its value = 73.1%

The value of it to the nearest tenth is 73.1%

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3 years ago

The amounts of food waste generated in a region during two years were 37,500,000 tons and 30,400,000 tons. What was the total fo

galben [10]

You can change the form of the number to scientific notation before or after you do the addition. Here, we see the sum will be less than 100 million tons, so we can convert to scientific notation before we do the addition without requiring extra steps. The total waste is the sum of the amounts of waste in the two years.

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4 years ago

Plzz help with my test

Aleksandr [31]

Y = 4

when you look at the -3 at the x-axis, it meets 4 at the y-axis

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3 years ago