21-3 (a-7) = a + 20, find a.
. 6.5
. 4.5
. 7.5
. 5.5
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4
Answer:
In this unit we consider how number patterns arise, how to find particular ... and finding the formula for a general term in a sequence. ... (f) 10, 9.5, 9, 8.5, 8, 7.5, . ... 2.5, 3.5, 4.5, 5.5, 6.5, .
Answered by
0
Answer:
8.5
Explanation:
21-3 (a-7) = a + 20
=> 21a-3a-147+21 = a+20
=> 18a-126= a+20
=> 18a-a = 20+126
=> 17a = 146
=> a = 146/17
=> a = 8.5
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