All categories

3 years ago

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

You might be interested in

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

Basile [38]

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 Sample Size : 32 50

Mean Monthly Purchases : $45.67 $39.87

Standard Deviation : $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.

Firstly, we will specify our null and alternate hypothesis;

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 Two-sample t-test statistics;

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.

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.

4 0

3 years ago