Answer:
12, 9.5, 7
Explanation:
Given:
U₁ = 22
U₂ = 19.5
U₃ = 17
U₄ = 14.5
U₂ = U₁ + d
19.5 = 22 + d
d = 19.5 - 22
= -2.5
U₅ = U₄ + d
= 14.5 + (-2.5)
= 12
U₆ = U₅ + d
= 12 + (-2.5)
= 9.5
U₇ = U₆ + d
= 9.5 + (-2.5)
= 7
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