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Roman55 [17]
3 years ago
6

The common difference ,d in an arithmetic sequence whose fourth term is 16 and whose seventh therm is 31

Mathematics
1 answer:
Natali [406]3 years ago
3 0

Answer: d=5

Step-by-step explanation:

Arithmetic progression

An=a1+d(n-1)

An= nth term

A1= first term

D= common difference

N= nth position

We are given the 4th and 7th terms

For 4th term,n=4

A4=a1+d(4-1)

A4= 16

16= a1+d(4-1)

16= a1+3d........equation 1

For the 7th term,n=7

A7=a1+d(7-1)

A7= 31

31=a1+6d......equation 2

Bring them together

16=a1+3d

31=a1+6d

Subtract equation 1 from 2

So we have

15=3d

D=15/3

D=5

Therefore, the common difference is 5

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Answer:

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Step-by-step explanation:

We know that the dive results in 40 gold coins.

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We conclude that:

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