All categories

3 years ago

Hi, i'd really appreciate it if someone answere this :)

Mathematics

2 answers:

Vesna [10]3 years ago

8 0

Answer:

Step-by-step explanation:

12 number

Wherever you see an n put in 12

12 (12 + 1)/2

12 * 13 / 2

6 * 13

The 12th triangular number is 78

50th triangular number

Again, wherever you see an n put in 50

n/2 * (n+ 1)

50/2 * (50 + 1)

25 * 51

1275

m_a_m_a [10]3 years ago

6 0

Answer:

12th triangular number is 78

50th triangular number is 1275

Step-by-step explanation:

12+1=13

12÷2=6

6x13=78

if you do this for 50 you get 1275

You might be interested in

Pls helppp Me with this problemm

denpristay [2]

Answer:

a) y=8

b) x= 9

Step-by-step explanation:

y/16= 2/4

y= 16 * 1/2 (cross multiply)

y= 8

b) x/5 = 36/20

x= 5 * 36/20 (cross multiply)

x= 9

5 0

3 years ago

What’s the product of 4(-3)

Kipish [7]

The product is -12 for this problem

7 0

3 years ago

If the point (3,4) is 6 units above the point P(x,y) and 11 units to the right of it, then what are the coordinates of the point

S_A_V [24]

Answer:

x = 3+11

y = 4 - 6

P(x,y) = P(15,-2)

7 0

3 years ago

Read 2 more answers

For a sample of 35 items from a population for which the standard deviation is 20.5, the sample mean is 458. At the 0.05 level o

Anika [276]

Answer:

Value of test statistics = 2.30

Step-by-step explanation:

We are given that for a sample of 35 items from a population for which the standard deviation is 20.5, the sample mean is 458.

Also, Null Hypothesis, $H_0$ : $\mu$ = 450

Alternate Hypothesis, $H_1$ : $\mu\neq$ 450

The test statistics that will be used here is One sample t-test statistics;

T.S. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample mean = 458

s = sample standard deviation = 20.5

n = sample of items = 35

So, test statistics = $\frac{458-450}{\frac{20.5}{\sqrt{35} } }$ ~ $t_3_4$

= 2.30

Therefore, the value of test statistics is 2.30 .

3 0

3 years ago

Write 45 in the form k squareroot 5 where k is an integer

Slav-nsk [51]

45=k√5
times both sides by √5
45√5=5k
divide both sides by 5
9√5=k

8 0

3 years ago