At the book sale, all books cost less than \$5.

1. What is the most expensive a book could be?
2. Write an inequality to represent the costs of a book at the sale.
3. Draw a number line to represent the inequality.

Kiran started his homework before 7:00 p.m. and finished his homework after 8:00 p.m. Let \(h\) represent the number of hours Kiran worked on his homework.

Decide if each statement is definitely true, definitely not true, or possibly true. Explain your reasoning.

1. \(h > 1\)

2. \(h > 2\)

3. \(h < 1\)

4. \(h < 2\)

Select all the expressions that are the result of decreasing \(x\) by 80%.

Solve each equation.

Here are 2 triangles.

Two triangles in an x y plane. Origin O. Horizontal axis from negative 6 to 6, by 1s. Vertical axis from negative 4 to 4, by 1s. Triangle A B C. Point A at negative 2 comma 4. Point B at negative 6 comma 1. Point C at negative 3 comma 1. Side A C is labeled 3 point 2. Side C B is labeled 3. Side A B is labeled 5. Triangle D E F. Point D at 3 comma negative 1. Point F at 4 comma negative 4. Point E at 7 comma negative 4. Angle F E D is labeled 36 point 9 degrees. Angle E D F is labeled 34 point 7 degrees. Angle D F E is labeled 108 point 4 degrees.

1. Show that the 2 triangles are congruent.
2. Find the side lengths of triangle \(DEF\) and the angle measures of triangle \(ABC\).