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4 years ago

Dominic's math class starts at 1:30 p.m. Math class is 50 minutes long.

Mathematics

2 answers:

hram777 [196]4 years ago

7 0

Answer:

2:20

Step-by-step explanation:

Dvinal [7]4 years ago

3 0

Answer:

2:20

Step-by-step explanation:

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What is the product of 4 2/7 and 11 1/4 ?

kolbaska11 [484]

Answer:

(4 2/7) x (11 1/4) = 48 3/14

Step-by-step explanation:

5 0

2 years ago

What is the simplified form of 8b^3c^ 2a + 4b^3c^2?

stiv31 [10]

$8b^{3} c^2+4b^{3} c^2$
$= (8+4) b^{3} c^2$
$=12 b^{3} c^2$

Be carefully, normally there is no a in your expression. I think you made a mistake.

Hope this helps !

Photon

8 0

3 years ago

A new post-surgical treatment is being compared with a standard treatment. Seven subjects receive the new treatment, while seven

a_sh-v [17]

Answer:

$(17.714-28.714) -2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -19.745$

$(17.714-28.714) +2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -2.255$

Step-by-step explanation:

For this case we have the following info given:

Treatment: 12 13 15 19 20 21 24

Control: 18 23 24 30 32 35 39

We can find the sample mean and deviations with the 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 repaplacing we got:

$\bar X_T = 17.714$ the sample mean for treatment

$\bar X_C = 28.714$ the sample mean for treatment

$s_T= 4.461$ the sample deviation for treatment

$s_C= 7.387$ the sample deviation for control

$n_T= n_C= 7$ the sample size for each sample

The degrees of freedom are given by:

$df= 7+7-2= 12$

The confidence interval for the difference of means is given by:

$(\bar X_T -\bar X_C) \pm t_{\alpha/2} \sqrt{\frac{s^2_T}{n_T} +\frac{s^2_C}{n_C}}$

The confidence is 98% so then the significance is $\alpha=0.02$ and $\alpha/2 =0.01$ . Then the critical value would be:

$t_{\alpha/2}=2.681$

And replacing we got:

$(17.714-28.714) -2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -19.745$

$(17.714-28.714) +2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -2.255$

4 0

4 years ago

Which function could produce the graph shown below?

Naily [24]

Answer:

It is the third option. I just got it correct.

Step-by-step explanation:

4 0

3 years ago

A family used a professional decorator to help furnish their new home. The decorator selected $1,580 worth of furnishings. The f

Diano4ka-milaya [45]

Answer:

Can you be more specific, like y is what and k is what because it tells us what x is but not the rest.

Step-by-step explanation:

3 0

3 years ago