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Alex787 [66]
4 years ago
7

Write the first five terms of the sequence defined by the explicit formula an=21-2n^2

Mathematics
2 answers:
Rus_ich [418]4 years ago
8 0
The answer to the squence is either d or a i believe
nikitadnepr [17]4 years ago
4 0

Answer: D. 19, 13, 3, -11, -29

Step-by-step explanation:

The first five terms can be found by taking n= 1,2,3,4,5

The given sequence is :

a_{n} =21-2n^{2}

Substituting n = 1,2,3,4,5 we have :

a_{1} =21-2(1^{2} )=21-2=19.

a_{2} =21-2(2^{2} )=21-8=13

a_{3} =21-2(3^{2} )=21-18=3

a_{4} =21-2(4^{2} )=21-32=-11

a_{5} =21-2(5^{2} )=21-50=-29

The first five terms of the sequence are

D. 19, 13, 3, -11, -29

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Blababa [14]
I’m pretty sure it’s the first one. 4(3a + 2)


4 x 3a = 12a
4 x 2 = 8
7 0
3 years ago
Factorise the following quadratic equations ​
vesna_86 [32]

Answer:

see explanation

Step-by-step explanation:

In 13 - 17

Consider the factors of the constant term which sum to give the coefficient of the x- term

13

x² - x - 42 = (x - 7)(x + 6)

15

x² + x - 6 = (x + 3)(x - 2)

17

x² - 27x + 50 = (x - 25)(x - 2)

19

r² - 25 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b) , thus

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= r² - 5² = (r - 5)(r + 5)

5 0
3 years ago
Read 2 more answers
Which ordered pair is the best estimate for the solution of the system of equations? y=−2.5x+6.5
-Dominant- [34]
Answer:
(11/7 , 18/7)

Explanation:
The second given equation is:
y = x + 1 ............> I
The first given equation is:
y = -2.5 x + 6.5 ..............> II

Substitute with I in II and solve for x as follows:
y = -2.5 x + 6.5
x + 1 = -2.5 x + 6.5
x + 2.5 x = 6.5 - 1
3.5 x = 5.5
x = 11/7

Now, substitute with x in equation I to get y as follows:
y = x + 1
y = 11/7 + 1
y = 18/7

Hope this helps :)



4 0
4 years ago
Pls??? I’ll help u if u help me!!!
il63 [147K]

Answer: the answer is 21

Step-by-step explanation:

5 0
3 years ago
Find the total cost of 58 bill;20%tip
BartSMP [9]

Answer:

11.8

Step-by-step explanation:


6 0
4 years ago
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