2 years ago

Statements Reasons

Mathematics

1 answer:

Otrada [13]2 years ago

6 0

Answer:

Step-by-step explanation:

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1,729 is divisible by 9<br> a. true<br> b. false

alexgriva [62]

It is b: False 1,729 isn’t divisible by 9

3 0

2 years ago

The sum of the first n terms of an arithmetic sequence is n/2(4n + 20).

lesantik [10]

Answer:

(a).

$S_{n} = \frac{n}{2} (4n + 20) \\ \\S _{n - 1} = \frac{(n - 1)}{2} (4n - 4 + 20) \\ \\ S _{n - 1} = \frac{(n - 1)}{2} (4n + 16) \\ \\S _{n - 1} = \frac{(n - 1)(4n + 16)}{2} \\ \\ { \boxed{S _{n - 1} = {2 {n}^{2} + 6n - 8}}} \\$

(b).

from general equation:

$S _{n - 1} = \frac{(n - 1)}{2} (4n + 16)$

first term is 4n

common difference:

$16 = \{(n - 1) - 1 \}d \\ 16 = (n - 2)d \\ d = \frac{16}{n - 2}$

8 0

2 years ago

i live in a house that 3 metets below sea level go to school 5 meters above sea level how many meters do i go

RideAnS [48]

3 meters below sea level represents a -3
From -3 to 0 is 3
3 + 5 above sea level = 8 meters
There are 8 meters between the house and the school

4 0

3 years ago

17. Find the length of the hypotenuse of an isosceles right triangle whose legs measure

defon

Answer:

4.950 m

Step-by-step explanation:

3.5^2+3.5^2=hypotenuse^2

3 0

2 years ago

I don’t understand these 3 questions and I need help.

rjkz [21]

Not sure about the first one but the second one is option c (or -3). You just have to factor and find the solutions (so it would be -7 and 4 and then u just add them)

For question 39 the answer is c

6 0

2 years ago

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