How many solutions does 4/5x + 2/3 + 1/5x = x have

Which of the following is not a property of a rhombus? Question 20 options: A) Diagonals are congruent. B) Opposite angles are c

insens350 [35]

Answer: A

Step-by-step explanation:

This is because diagonals of a rhombus are perpendicular not congruent, ]

Pependicular means at an angle of 90°

If this helped please mark brainliest

5 0

3 years ago

I NEED THIS ASAP!!!!!!!!

Stels [109]

Answer: C

I think

Step-by-step explanation:

A is false

B is false

C is true

D is false

5 0

3 years ago

Read 2 more answers

Based on an indication that mean daily car rental rates may be higher for Boston than for Dallas, a survey of eight car rental c

Elina [12.6K]

Answer:

$t=\frac{(47 -44)-(0)}{3\sqrt{\frac{1}{8}+\frac{1}{9}}}=2.058$

The degrees of freedom are:

$df=8+9-2=15$

And the p value would be:

$p_v =P(t_{15}>2.058) =0.0287$

Since we have a p value lower than the significance level given of 0.05 we can reject the null hypothesis and we can conclude that the true mean for car rental rates in Boston are signiﬁcantly higher than those in Dallas

Step-by-step explanation:

Data given

$n_1 =8$ represent the sample size for group Boston

$n_2 =9$ represent the sample size for group Dallas

$\bar X_1 =47$ represent the sample mean for the group Boston

$\bar X_2 =44$ represent the sample mean for the group Dallas

$s_1=3$ represent the sample standard deviation for group Boston

$s_2=3$ represent the sample standard deviation for group Dallas

We can assume that we have independent samples from two normal distributions with equal variances and that is:

$\sigma^2_1 =\sigma^2_2 =\sigma^2$

Let the subindex 1 for Boston and 2 for Dallas we want to check the following hypothesis:

Null hypothesis: $\mu_1 \leq \mu_2$

Alternative hypothesis: $\mu_1 > \mu_2$

The statistic is given by this formula:

$t=\frac{(\bar X_1 -\bar X_2)-(\mu_{1}-\mu_2)}{S_p\sqrt{\frac{1}{n_1}+\frac{1}{n_2}}}$

Where t follows a t student distribution with $n_1+n_2 -2$ degrees of freedom and the pooled variance $S^2_p$ is given by this formula:

$\S^2_p =\frac{(n_1-1)S^2_1 +(n_2 -1)S^2_2}{n_1 +n_2 -2}$

Replacing we got:

$\S^2_p =\frac{(8-1)(3)^2 +(9 -1)(3)^2}{8 +9 -2}=9$

And the deviation would be just the square root of the variance:

$S_p=3$

The statitsic would be:

$t=\frac{(47 -44)-(0)}{3\sqrt{\frac{1}{8}+\frac{1}{9}}}=2.058$

The degrees of freedom are:

$df=8+9-2=15$

And the p value would be:

$p_v =P(t_{15}>2.058) =0.0287$

Since we have a p value lower than the significance level given of 0.05 we can reject the null hypothesis and we can conclude that the true mean for car rental rates in Boston are signiﬁcantly higher than those in Dallas

5 0

4 years ago

The perimeter of one face of a cube is 16cm. Calculate the volume of the cube.

erastova [34]

Answer:

4

Step-by-step explanation:

Perimeter equation: Length + Width * 2

so divide 2 by 16

which gives you 8 and minus that by its half so you get 4

4 0

3 years ago

The Jackson's have two pet dogs named Beau and Max. Beau is 2 years older than Max. The sum of their ages is 16 years. How old i

11111nata11111 [884]

Answer:

Beau is 9
Max is 7

Step-by-step explanation:

Let the dogs' ages be represented by b and m.

b + m = 16

b - m = 2

Adding these equations gives ...

2b = 18

b = 9 . . . . . . divide by 2

m = 7 . . . . . . 2 years younger than Beau

Beau is 9; Max is 7.

_____

Once you realize the above solution is generic, you can write down the answer that <em>(older)</em> Beau is half the <em>sum</em> of the given numbers: (16 +2)/2 = 9. Then Max's age is easily found, or it can be computed as half the difference of the given numbers: (16 -2)/2 = 7.

7 0

3 years ago