Hi I need help with this homework so I can get a good grade on the test

What impact does negative rational numbers have on whether you add or subtract rational numbers

Artemon [7]

If the signs of the rational numbers are the same, you add them, i.e. ++ or --.
If they are different, you subtract them, i.e. +- or -+

7 0

3 years ago

Does anyone know thsi

Dvinal [7]

Answer:

159.75 m

Step-by-step explanation:

Formula for the area of a triangle:

$A= \frac{(base)(height)}{2}$

base = 15

height = 21.3

(15)(21.3) = 319.5

319.5 divided by 2 = 159.75 m

8 0

3 years ago

Meat costs $8.00 per pound at a store. What is the slope?

-BARSIC- [3]

Answer:

The slope is 8.

Step-by-step explanation:

If you were to graph the price of meat per pound, you would need to choose the x-axis and y-axis labels.

The x-axis is the independent variable, meat in pounds.

The y-axis is the dependent variable, price in dollars.

The price depends on the number of pounds you buy.

Slope is calculated using rise over run, or:

$m = \frac{rise}{run}$

"Rise" is the number of squares going up.

"Run" is the number of squares going to the right.

In the graph below, to go from one red dot to the next, you count 1 to the right and 8 going up.

$m = \frac{rise}{run}$

$m = \frac{8}{1}$

$m=8$

Therefore, the slope is 8.

8 0

3 years ago

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A random variable X follows the uniform distribution with a lower limit of 670 and an upper limit of 750. a. Calculate the mean

weqwewe [10]

Answer:

a) $E(X) = \frac{a+b}{2}=\frac{670+750}{2}= 710$

The variance is given by:

$Var(X) =\frac{(b-a)^2}{12}= \frac{(750-670)^2}{12}= 5333.3333$

And the deviation is just the square root of the variance and we got:

$Sd(X) = \sqrt{5333.333}= 23.09$

b) $P(X$

And for this case we can use the cumulative distribution given by:

$F(X) = \frac{x-a}{b-a} , a \leq x \leq b$

And replacing we got:

$P(X$

Step-by-step explanation:

For this case we assume that X is our random variable and we know that the distribution for X is given by:

$X \sim Unif(a=670, b = 750)$

Part a

For this case the expected value is given by:

$E(X) = \frac{a+b}{2}=\frac{670+750}{2}= 710$

The variance is given by:

$Var(X) =\frac{(b-a)^2}{12}= \frac{(750-670)^2}{12}= 5333.3333$

And the deviation is just the square root of the variance and we got:

$Sd(X) = \sqrt{5333.333}= 23.09$

Part b

For this case we want to find this probability:

$P(X$

And for this case we can use the cumulative distribution given by:

$F(X) = \frac{x-a}{b-a} , a \leq x \leq b$

And replacing we got:

$P(X$

5 0

3 years ago

Bobby is five years old which of these could be his height 100m 100cm 100km

egoroff_w [7]

Answer:

100 cm = 3.2808399 ft.

Step-by-step explanation:

If you round the feet up, you get about 3ft.

Hope this helps, have a great day/night!

3 0

3 years ago

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