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9. A block is pulled to the right across a level surface at a constant velocity by a horizontal force of 48 newtons, as shown. The weight of the block is 91 newtons. What is the coefficient of kinetic friction between the block and the surface?

10. A block has a mass of $81.0$ kilograms. The coefficient of static friction between the block and the level floor on which it rests is 0.621. A horizontal force of 398 newtons is applied to the block to the right, as shown. Will the block move?

Two boats leave the shore at the same time to take supplies to neighboring islands. One of the boats returns every 45 minutes. The other boat returns every hour. How long will it take for the two boats to return at the same time?

A die is rolled, find the probability that an even number is obtained.

Amy pays $25 to enter a state fair, plus $3 for each ride. Which of the following equations represent her total cost?

⭕ A. y = 28x

⭕ B. y = 3x + 25

⭕ C. y = 25x + 3

⭕ D. y = 3x + 28