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Answer:
1)x=7
Step-by-step explanation:
1) 3,5,9,x,11 = 7
(3+5+9+x+11)/5=7
(28+x)/5=7
we want x on its own bring the 5 over we dont like division
28+x=7*5
28+x=35
x=35-28
x=7
(3+5+9+7+11)5=7
sorry dont know what 2 is asking
3) a triangles area is B*H/2 B= base H=height
3=B and 4=H
3*4/2
3*4=12
12/2=6 and because its area we do the units squared