The complete sequence will be:
7.5, 6.25, 5, 3.75, 2.50
This is an arithmetic sequence. The formula to find the nth term of an arithmetic sequence is:
= a + (n - 1)d
where,
a = first term = 7.5
n = number of terms
d = common difference = 6.25 - 7.5 = -1.25
Therefore, 4th term will be:
= a + (n - 1)d
where, n = 4
= a + (4 - 1)d
= a + 3d
= 7.5 + 3(-1.25)
= 7.5 - 3.75
4th term = 3.75
5th term will be:
= a + (n - 1)d
where, n = 5
= a + (5 - 1)d
= a + 4d
= 7.5 + 4(-1.25)
= 7.5 - 5.0
5th term = 2.5
In conclusion, the 4th and 5th terms are 3.75 and 2.5.
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