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3 years ago

Simplyfy using appropiate properties 1/4×2/5+-1/6×3/2+3/7×2/5

Mathematics

2 answers:

Triss [41]3 years ago

7 0

Answer:

-1/35

Step-by-step explanation:

* means multiply

because of pemdas you should do three multiplication parts first

(1/4×2/5)+(-1/6×3/2)+(3/7×2/5)

1/20 - 3/12 + 6/35

3/60 - 15/60 + 6/35

-12/60 + 6/35

-1/5 + 6/35

-7/35 + 6/35

-1/35

Over [174]3 years ago

3 0

Answer:

3/140

Step-by-step explanation:

1/4 × 2/5 + (-1/6) × 3/2 + 3/7 × 2/5 =

= 2/20 - 3/12 + 6/35

**********************************************

We need the LCD of 20, 12, 35.

20 = 2^2 * 5

12 = 2^2 * 3

35 = 5 * 7

LCD = 2^2 * 3 * 5 * 7 = 420

**********************************************

= 42/420 - 105/420 + 72/420

= 9/420

= 3/140

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You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of sleep subjects get each nig

brilliants [131]

Answer:

Confidence interval

$8.98-2.2\frac{1.29}{\sqrt{12}}=8.16$

$8.98+2.2\frac{1.29}{\sqrt{12}}=9.80$

And the margin of error would be:

$ME=2.2\frac{1.29}{\sqrt{12}}=0.819$

Step-by-step explanation:

For this case we have the followig dataset:

DATA: 8.2; 9.1; 7.7; 8.6; 6.9; 11.2; 10.1; 9.9; 8.9; 9.2; 7.5; 10.5

We can calculate the mean and the deviation with the following formulas:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

$s =\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

And replacing we got:

$\bar X= 8.98[/tex[tex]s = 1.29$

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom are given by:

$df=n-1=12-1=11$

The Confidence level is 0.95 or 95%, the value of significance is $\alpha=0.05$ and $\alpha/2 =0.025$ , and the critical value would be $t_{\alpha/2}=2.20$

Repplacing the info we got:

$8.98-2.2\frac{1.29}{\sqrt{12}}=8.16$

$8.98+2.2\frac{1.29}{\sqrt{12}}=9.80$ And the margin of error would be:

$ME=2.2\frac{1.29}{\sqrt{12}}=0.819$

7 0

3 years ago

Tina has 3/5 pound of rice. she will use 2/3 of it to make fries rice for her family. how much rice will Tina use to make fried

aliina [53]

The answer is -1/15 or 0.66666

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4 years ago

A basketball player attempts 15 baskets in a game. He makes 9 of the attempted baskets. Write the value of the ratio that descri

ivann1987 [24]

The basketball player attempted to do 15 baskets.

He made 9 of these baskets.

You must write a ratio that says:

attempted baskets:baskets made

Since he attempted 15 baskets and made 9 baskets, the answer would be:

15:9

5 0

3 years ago

Read 2 more answers

PLEASE HELP I REALLY NEED THE ANSWER AND I WOULD APPRECIATE IT(NO SPAMMING) I WANT TO FIND THE PERIMETER NOT THE AREA!!!

Anna [14]

The perimeter would be 20m:)

7 0

3 years ago

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A circle has a diameter 9cm<br><br>Pls help meeeeeeeeeeeeeeeeeeeeeee

Slav-nsk [51]

Answer:

A=63.585 cm²

Step-by-step explanation:

Note : It is not given what to find so i am finding are of the circle.

D=9cm

r=D/2

r=9/2

r=4.5

Area of the circle :

A=πr²

A=π4.5²

A=63.585 cm²

7 0

3 years ago

Simplyfy using appropiate properties 1/4×2/5+-1/6×3/2+3/7×2/5 ​

Simplyfy using appropiate properties 1/4×2/5+-1/6×3/2+3/7×2/5