Answer:
Step-by-step explanation:
25.96/4 = 6.49
0.17/30 = x/450 <em>Use proportion</em>
76.50 = 30x <em>Cross multiply</em>
2.55 = x <em>Divide 30 both sides</em>
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7.5 minutes call would cost 2.55
A = 31.8 cm2
Yhe formula:
central angle = (180-135)° = 45°
Hope this helps