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Sav [38]
3 years ago
12

Help ill give brainiest, dont guess. first answer gets brainiest

Mathematics
1 answer:
Illusion [34]3 years ago
6 0

Answer:

8. Surface area = 85.5cm^2

9.  Volume = 45.5cm^3

Step-by-step explanation:

8. A=2(wl+hl+hw)=2·(2·6.5+3.5·6.5+3.5·2)=85.5

9. V=whl=2·3.5·6.5=45.5

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What is the nearest cubic unit for the radius and volume of a cylinder with a height of 9
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Answer:

Step-by-step explanation:

6 0
3 years ago
Prof. Shanks assigns 5 students to work on a project. The group is to have no more than 1 freshman. In how many ways can the gro
polet [3.4K]

Answer:

1302

Step-by-step explanation:

10C5 + (5C1×10C4) = 1302

8 0
3 years ago
A dermatology patient is treated with ultraviolet light having a wavelength of 375 nm. What is the wavelength expressed in centi
sergeinik [125]
1 nanometer = 1 * 10^9 meters

so 1 nanometer =  1 * 10^7 centimeters

375 nanometers =  3,75 *  10^5 centimeters
4 0
3 years ago
Read 2 more answers
What is the difference written in scientific notation 1.3x10^6 - 6.8 x 10^5
Pavlova-9 [17]

One way to solve this is to revert to integers.

Do this by moving the decimal in 1.3 to the right 6 places (indicated by the positive power value) and then 6.8 move the decimal to the right 5 places (same reason)

Now you have 1,300,000 & 680000. Subtract to get 620,000.

Now convert your product to scientific notation again by moving your decimal to the left until you are left with 6.2 x ? The question mark will be 10 to the number of places you moved the decimal. 10^5

We have 6.2 x 10^5.

It is import to note that when the decimal must be moved to the right for values less than one, the power will be negative.

3 0
3 years ago
Read 2 more answers
A major retail clothing store is interested in estimating the difference in mean monthly purchases by customers who use the stor
mixer [17]

Answer:

Critical value is t = 1.9901

Step-by-step explanation:

We are given the results of the sampling :

                                     In-House Credit Card                National Credit Card                    <u>Sample Size</u> :                              32                                                    50

<u>Mean Monthly Purchases </u>:      $45.67                                            $39.87

<u>Standard Deviation </u>:                $10.90                                             $12.47

Also, the managers wished to test whether there is a statistical difference in the mean monthly purchases by customers using the two types of credit cards, using a significance level α of 0.05.

<em>Firstly, we will specify our null and alternate hypothesis;</em>

Let \mu_1 = Mean Monthly Purchases of In-House Credit Card

     \mu_2 = Mean Monthly purchases of National Credit Card

So, Null Hypothesis, H_0 : \mu_1-\mu_2 = 0  {means that there is no difference in the mean monthly purchases by customers using the two types of credit cards}

Alternate Hypothesis, H_0 : \mu_1-\mu_2\neq 0  {means that there is statistical difference in the mean monthly purchases by customers using the two types of credit cards}

The test statistics that will be used here is <u>Two-sample t-test statistics</u>;

              T.S. = \frac{(\bar X_1-\bar X_2)-(\mu_1-\mu_2)}{s_p \sqrt{\frac{1}{n_1}+\frac{1}{n_2}  } }  ~ t_n___1+n_2-_2

where, \bar X_1 = Sample mean Purchases of In-House Credit Card = $45.67

           \bar X_2 = Sample mean Purchases of National Credit Card = $39.87

            s_p = pooled variance

            n_1 = In-house credit card sample = 32

            n_2 = National credit card sample = 50

So, degree of freedom of t-value here is (32 + 50 - 2) = 80

Now, at 0.05 significance level, t table gives critical value of t = 1.9901 at 80 degree of freedom.

<em>Therefore, the critical value assuming the population standard deviations are not known but that the populations are normally distributed with equal variances is t = 1.9901.</em>

4 0
3 years ago
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