In a Northwest Washington County, speeding fines are determined by the formula

F=7 (s - 65) + 70

where F is the cost, in dollars, of the fine if a person is caught drwing at a speed of smiles per hour.

If a fine comes to $266, how fast was the person speeding?

The person was speeding at 93 miles per hour.

Step-by-step explanation:

Step 1: Given the equation to find speeding fine F = 7 (s - 65) + 70 Step 2: Substitute given details in the equation and find s. F = $266

⇒ 266 = 7 (s - 65) + 70

⇒ 266 = 7s - 455 + 70

⇒ 266 = 7s - 385

⇒ 651 = 7s

⇒ s = 651/7 = 93