∵ The graph represents b(m) = 22 + 0.12 m , where
→ m is the number of the minutes
→ b(m) is the cost of the calls
∵ x = 93 minutes
→ Look at the graph and try to find the value of b(93)
∵ 4 intervals on the b(m) axis and m axis represent 200
∴ Each interval = 200/4 = 50 dollars and 50 minutes
• Then 93 will be nearest to the second intervals go up to find the value of b(m)
∴ b(93) = 35 means between 30 and 40
The bill will be about $35
