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3 years ago

-1 3/5 divided by -2/3 written as mixed number

1 answer:

8 0

First, you must change all of this into improper fractions, like shown below.
$- \frac{8}{5}\div - \frac{2}{3} =$
Now you must change the sign.
$- \frac{8}{5}* - \frac{2}{3} =$
Then we must reciprocalize 2/3.
$- \frac{8}{5}* - \frac{3}{2} =$
Now we multiply, to get 2 4/10.

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Anyone good at statistics? Please help me

Lyrx [107]

I am good at it i can help u

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3 years ago

(tan theta+ cot theta)^2= sec^2 theta+cosec^2 theta

Virty [35]

Answer:

Proved that $(\tan \theta + \cot \theta)^{2} = \sec^{2} \theta + \csc^{2} \theta$ .

Step-by-step explanation:

We have to prove that

$(\tan \theta + \cot \theta)^{2} = \sec^{2} \theta + \csc^{2} \theta$

Now, Left hand side

= $(\tan \theta + \cot \theta)^{2}$

= $\tan^{2} \theta + 2\times \tan \theta \times \cot \theta + \cot^{2} \theta$ {Since we know the formula (a + b)² = a² + 2ab + b²}

= $\tan^{2} \theta + 2 + \cot^{2} \theta$

{Since $\tan \theta \times \cot \theta = 1$ }

= $(\tan^{2} \theta + 1) + (\cot^{2} \theta + 1)$

= $\sec^{2} \theta + \csc^{2} \theta$

{Since we know the identities:

$\sec^{2} x = \tan^{2} x + 1$ and $\csc^{2} x = \cot^{2} x + 1$ }

= Right hand side

Hence, proved.

7 0

3 years ago

A cylinder cardboard tube with a diameter of 8 centimeters and a height of 20 centimeters is used to package a gift. What is the

FromTheMoon [43]

30 i believe is your answerio

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3 years ago

Read 2 more answers

$4,000 cost is what percent (%) of $6,000 sales price?

puteri [66]

IT SHOULD BE 240,000

OR

66.667%

4 0

3 years ago

Read 2 more answers

Which of the following is a true statement? a) The coefficient of determination can assume negative values. b) A negative correl

tiny-mole [99]

Answer:

Step-by-step explanation:

Hello!

a) The coefficient of determination can assume negative values.

FALSE

The coefficient of determination gives you an idea of how much of the variability of the dependent variable (Y) is due to the explanatory variable(s). It takes values in the range from 0 to 1, where 0 indicates that the explanatory variable has nothing to do with the variability of the dependent variable and 1 indicates that all the variability of the dependent variable is due to the explanatory variable. The closer the coefficient is to 1, the better the regression model.

b) A negative correlation indicates that as values of x decrease, values of y will decrease.

FALSE

The linear correlation analysis studies the association between two variables X and Y. A negative linear correlation means that when you draw the linear association the slope of it will be negative. A negative slope indicates that every time X increases, Y will decrease. (see example attached)

c) If there is no correlation between the independent and dependent variables, then the value of the correlation coefficient must be -1.

FALSE

This coefficient gives an idea of the degree of correlation between the variables.

If ρ = 0 then there is no linear correlation between X and Y Graphically, the slope is cero

If ρ < 0 then there is a negative association between X and Y (i.e. when one variable increases the other one decreases) In a graphic, the slope of the line is negative.

If ρ > 0 then there is a positive association between X and Y (i.e. Both variables increase and decrease together)

d) The variable that is being predicted in regression analysis is the dependent variable.

TRUE

The dependent variable, Y, is the variable that is expected to change when the researcher manipulated the independent variable(s).

e) The correlation coefficient r is always greater than 1.

FALSE

The coefficient r takes values between -1 and 1

I hope it helps!

8 0

3 years ago