Find the circumference of the circle.

−10 = −0.4k<br><br> this is probably easy but can someone find k

azamat

Answer: k = 25

hope this helped :)

5 0

3 years ago

What is the sum of the arithmetic series 18 t=1 (3t-4)

PolarNik [594]

Consider the arithmetic series $_{t=1}\Sigma^{t=18} (3t-4)$

Let t=1 in the given series, we get

first term = $a_{1}$ = 3-4 = -1.

Let t=2 in the given series, we get

second term = $a_{2}$ = $(3 \times 2)-4 = 2$

Let t=3 in the given series, we get

third term = $a_{3} = (3 \times 3)-4=5$

Now, let t=18 in the given series, we get

last term = l = $l = (3 \times 18)-4 = 50$

We get the series as

-1, 2, 5,..... 50

Sum = $\frac{n}{2}(a+l)$

= $\frac{18}{2}(-1+50)$

= $= 9 \times 49$

= 441

Therefore, the sum of the given arithmetic series is 441.

7 0

4 years ago

Read 2 more answers

True or False: If a chi-square test is significant (i.e., there is an association between the variables), we should look at the

AnnyKZ [126]

Answer: True.

Step-by-step explanation:

A conditional distribution in this case is a probability distribution for a sub-population. In other words, it represent the probability that a randomly selected item in a sub-population has a characteristic we’are interested in .

Partitioning the popular action assist us to see if the sub-population contains the characteristics we ere interested in I.e . Association

7 0

3 years ago

Algebra applications: find the value of x and y

Inga [223]

Answer : The value of x and y is 8 and 10 respectively.

Step-by-step explanation :

As we known that if two parallel lines are cut by a transversal line then consecutive interior angles are supplementary.

From the given figure we conclude that:

$5x-y+150=180$ ...........(1)

$5x-y=180-150$

$5x-y=30$ ............(2)

$5x+y+130=180$ ...........(3)

$5x+y=180-130$

$5x+y=50$ ...........(4)

Now we adding equation 2 and 4, we get the value of x.

$5x-y+5x+y=30+50$

$10x=80$

$x=8$

Now we are putting the value of x in 4, we get the value of y.

$5x+y=50$

$5(8)+y=50$

$y=50-40$

$y=10$

Therefore, the value of x and y is 8 and 10 respectively.

3 0

4 years ago

Barbara claims that her horse can do simple addition problems. She showed her horse 8 different cards with simple addition probl

Nataliya [291]

Answer:

"Yes, the chances of getting 8 correct when guessing are very low"

Step-by-step explanation:

The point diagrams show us how likely is the occurrence of an event. When casting 8 coins there is a chance to get between 1 and 8 tails.

The dot plot tells us how many times 1, 2, 3, 4, 5, 6, 7 or 8 tails were obtained. When the number of trials increases, then the value with the most points in the diagram represents the number of queues most likely to be obtained, and the value with fewer points represents the least probable number of queues that can be obtained by casting 8 times a coin .

The dot plot for the experiment shows that it is very unlikely to get 8 queues when casting 8 coins. Of 53 times, this only happened once.

Just as it is unlikely to get 8 tails when throwing 8 coins, it is also unlikely that a horse guesses the 8 correct answers of the 8 simple sum problems. Then, the horse of barbara maybe did not guess the 8 answers.

Therefore the correct answer is option A:

"Yes, the chances of getting 8 correct when guessing are very low"

3 0

3 years ago