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cestrela7 [59]
3 years ago
6

The first term of an arithmetic sequence is -3 and the 15th term is 53. What is the common difference of the sequence?

Mathematics
1 answer:
Fittoniya [83]3 years ago
4 0

Answer:

c = 4

Step-by-step explanation:

Let the common difference be c.  Then a(n) = -3 + c(n-1).  Since a(15) = 53, a(15) = -3 + (15-1)c = 53.  Therefore, -3 + 14c = 53, or 14c = 56; c = 4.  


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Factorise each of the following algebraic expressions completely,
LekaFEV [45]

Answer:

see explanation

Step-by-step explanation:

(a)

Given

2k - 6k² + 4k³ ← factor out 2k from each term

= 2k(1 - 3k + 2k²)

To factor the quadratic

Consider the factors of the product of the constant term ( 1) and the coefficient of the k² term (+ 2) which sum to give the coefficient of the k- term (- 3)

The factors are - 1 and - 2

Use these factors to split the k- term

1 - k - 2k + 2k² ( factor the first/second and third/fourth terms )

1(1 - k) - 2k(1 - k) ← factor out (1 - k) from each term

= (1 - k)(1 - 2k)

1 - 3k + 2k² = (1 - k)(1 - 2k) and

2k - 6k² + 4k³ = 2k(1 - k)(1 - 2k)

(b)

Given

2ax - 4ay + 3bx - 6by ( factor the first/second and third/fourth terms )

= 2a(x - 2y) + 3b(x - 2y) ← factor out (x - 2y) from each term

= (x - 2y)(2a + 3b)

8 0
3 years ago
When The Product of 15 and 40 is divided by the sum of 15 and 45 what is the quotient?
BaLLatris [955]

Answer:

10

Step-by-step explanation:

(15 x 40) / (15+40)

solve inside the parenthesis:

600/60

divide:

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6 0
3 years ago
Describe how you would find the missing numbers in the equation below. What is the missing numerator and denominator?
Ugo [173]

Answer:

3 and 5 is the correct answer in this question

Step-by-step explanation:

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3 0
1 year ago
Use the Distributive Property to solve the equation.<br>4(x - 6) + 6 = 6x-2​
KatRina [158]

Answer:

x = -8

Step-by-step explanation:

(4 · x) - (4 · 6) + 6 = 6x - 2

4x - 24 + 6 = 6x - 2

4x - 18 = 6x - 2

Isolate x.

4x = 6x - 2 + 18

4x = 6x + 16

4x - 6x = 16

-2x = 16

x = 16 ÷ -2

x = -8

I hope this helps! :)

5 0
3 years ago
Read 2 more answers
Are the following expressions equivalent? Why or why not? <br> 6(2x + 4) and 12x + 24
MrMuchimi

Answer: Yes

Step-by-step explanation:

When using the distributive property, 6(2x + 4) becomes 12x + 24

6 * 2x = 12x and 6 * 4 = 24

12x + 24 = 12x + 24

Therefore, the expressions are equivalent.

8 0
3 years ago
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