Is it equilateral or equiangular or regular?

The slope of the line whose equation is 3x - 2y = 4 is -2

marissa [1.9K]

-2/3 is the slope of 3y + 2x = 1

5 0

4 years ago

A total of $3800 is invested into two accounts paying 4% and 7% annual interest. In one year the combined interest on the accoun

Sedaia [141]

To find the money you make, take:

x(1 (+ or -) % interest rate) * Time

So in this case, it would be:

3800(1+0.04)(1) = Ans
and
3800(1+0.07)(1) = Ans

Assumably, combining those totals would give you $218. If you take the total of 3800(1+0.04)(1), subtract that from $218.

218 - (3800(1+0.04)(1)) = Your Answer

8 0

3 years ago

A marketing study was conducted to compare the mean age of male and femlae purchasers of a certain product. random and independe

notka56 [123]

Answer:

A. t ≥ 1.734

Step-by-step explanation:

Data given and notation

$\bar X_{m}=39.80$ represent the mean for the sample male

$\bar X_{f}=50.30$ represent the mean for the sample female

$s_{m}=10.040$ represent the sample standard deviation for the males

$s_{f}=13.215$ represent the sample standard deviation for the females

$n_{m}=10$ sample size for the group male

$n_{f}=10$ sample size for the group female

t would represent the statistic (variable of interest)

Concepts and formulas to use

We need to conduct a hypothesis in order to check if the mean for females is higher than the mean for males, the system of hypothesis would be:

Null hypothesis: $\mu_{f}-\mu_{m}\leq 0$

Alternative hypothesis: $\mu_{f} - \mu_{m}> 0$

We don't have the population standard deviation, so for this case is better apply a t test to compare means, and the statistic is given by:

$t=\frac{(\bar X_{f}-\bar X_{m})-\Delta}{\sqrt{\frac{s^2_{f}}{n_{f}}+\frac{\sigma^2_{m}}{n_{m}}}}$ (1)

And the degrees of freedom are given by $df=n_m +n_f -2=10+10-2=18$

t-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.

What is the test statistic?

With the info given we can replace in formula (1) like this:

$t=\frac{(50.3-39.80)-0}{\sqrt{\frac{13.215^2}{10}+\frac{10.040^2}{16}}}}=2.001$

Critical value

For this case since we have a right tailed test we need to look into the t distribution with 18 degrees of freedom a value that accumulates 0.05 of the area on the right, and on this case:

$t_{crit}=1.734$

And the rejection zone of the null hypothesis would be: A. t ≥ 1.734

For our case our calculated value is higher than the critical value so we have enough evidence to reject the null hypothesis at the 5% of significance.

8 0

4 years ago

Han recorded the number of pages that he read each day for five days. the dot plot shows his data. pages the mean, or average, f

Paul [167]

If the mean of the data set is 32.6. Then the number of pages he read in 5 days is 163.

Mean is simply defined as the average of the given set of numbers. The mean is considered as one of the measures of central tendencies in statistics. The mean is said to be an arithmetic mean. It is the ratio of the sum of the observation to the total number of observations.

Han recorded the number of pages that he read each day for five days.

If the mean of the data set is 32.6 pages. Then the total number of the pages he read till now, will be

Let the total number of the pages be x. Then we have

$\rm \dfrac{x}{5} = 32.6\\\\x \ = 5 \times 32.6 \\\\x \ = 163$

More about the mean link is given below.

brainly.com/question/521501

#SPJ1

5 0

2 years ago

Hi, can someone please help?

LuckyWell [14K]

Step-by-step explanation:

a)

8÷2=4

12÷3=4

27÷9=3

•it does'nt always take the same amount of time to serve each customer .

•10×3=30

b)

according to the question

2=18 point

4=36 point

8=72 point

18=9×2

36=9×4

72=9×8

so 1dollar =9point

•each dollar spent appears to earn the same number of point

•because 81=9×9, it costs 9 dollar

6 0

3 years ago