What it means a line on top of a number

4x^2-12+9=0 complete the square

Angelo rode his bike around the bike trail that was 1/4 of a mile long he wrote his bike around the trail eight times Angelo says he wrote a total of 8/4 mile Teresa says he is wrong and then he actually Road 2 miles who is correct use words and

Hakim recorded his finishing time, in seconds, for each time he ran the 100 m race during one track season. What was the median of his finishing times? 12.0, 12.4, 11.9, 12.1, 12.2, 12.4, 12.1, 12.3, 11.9

The height of a triangle is 4 m less than its base. The area of the triangle is 48 m^2. What is the length of the base?

If x = y then what is 10 * 5^2 power?

7. Find the slope of the line through (-2,6) & (3,14).

Circular gears P and Q start rotating at the same time at constant speeds. Gear P makes 10 revolutions per minute and Gear Q makes 40 revolutions per minute.

A triangle with vertices (0, 1), (4, 1), and (1, 5) is reflected across the x-axis. What are the new vertices of the reflected triangle?

Using only whole numbers Nikki wrote as many multiplication equations as she could with 12 as the product what where her equations

The price of an item is $12.25. You give the cashier a $10 and a $5 bill. What is the change?