3 years ago

3. The first four terms of a sequence are:

Mathematics

2 answers:

iren2701 [21]3 years ago

3 0

Step-by-step explanation:

tn=n(n+1)(2n+1)

t23=23(23+1)(2*23+1)

t23=36754

tatiyna3 years ago

3 0

Answer:

The 23rd term is 2806.

Step-by-step explanation:

The other answerer has used the formula but i'm answering from the assumption that T1 to T4 are correct.

Each term is the sum of n terms of an arithmetic series with first term a1 = 12 and common difference d = 10.

Sum of n terms = (n/2)[2a1 + d(n - 1)]

So the sum of 23 terms =

= 23/2 (2*12 + 10 * 22)

= 11.5 * 244

= 2806.

You might be interested in

Please can someone actually help me!!!!

Fudgin [204]

The the the answer answer to to that that is is the the 3 one

6 0

3 years ago

PLEASE HELP I’m bad at math

sleet_krkn [62]

Answer:

Step-by-step explanation:

The GCF of 42 and 12 is 6

5 0

3 years ago

Evaluate 2xy - 3x for x = - 2 and y = 7.

Slav-nsk [51]

Look below!
2(-2)(7)-3(-2)
-28-(-6)
(Don't forget that when you have two negative signs next to each other, you can make it addition)
SO, -28+6
=-22
Hope that helped!

3 0

3 years ago

Are these ratios proportional (which means equal)?

Anni [7]

Answer:

yes

9/17 *4 is 36/68.

so for proportional you need to simplify the other term and if they both result in same then they both are proportional

Step-by-step explanation:

7 0

3 years ago

Freddy the frog is climbing up a well. Every day he climbs up 3 m but some nights he falls asleep and slips back 4m at the start

Anarel [89]

Answer: The frog fell asleep for 4 nights.

Step-by-step explanation: First, he climbs up 3m every night. there are 16 nights before he gets to 29m. He has not climbed up for the 16th day so 15*3= 45. 45-29= 16. 16/4=4. The frog slept for 4 nights.

7 0

3 years ago