Answer:
10
Step-by-step explanation:
Given
f(x) = x + 4 ← substitute x = 9
f(9) = × 9 + 4
= 2 × 3 + 4
= 6 + 4
= 10
x = 28
(3x + 6^o) = 90^o
3x = 84^o
41-275=234
15-47=62
-72-{151}=223
612-144=174
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