If s = 4, what is the value of 20s - 15s ?

A square is inscribed in a circle with radius 6 inches. What is the perimeter of the square in inches?

A square's perimeter is the sum of the lengths of its four sides. As a result, we can calculate a square's perimeter by adding its four sides together. Each side of a square has the same length. Therefore, the side of a square is added four times to determine the perimeter of square.
Each side of a square with a 9-square-inch area is 3 inches long. Therefore, 3 inches multiplied by 3 inches equals 9 inches. (Length times height is a square's surface area formula.) A square has four sides; therefore, multiplying '3' by '4' gives us the perimeter, which is 12 inches.

3x - 0.6 = 1.8
What value of x satisfies the equation above?

5(x - 3)(x + 1) = 0
What positive value of x satisfies the equation above?

x + y = 5
2x = 5
If (x, y) is the solution to the given system of equations, what is the value of y ?

The graph of y = mx + b, where m and b are constants, is shown in the xy-plane.

What is the value of m?

When the speed of an object approaches the speed of light, its length as seen by an observer changes. When the object is stationary relative to an observer, its length is S, and when the same object is moving at speed v relative to the observer, its length is L. The formula above expresses L in terms of S, v, and c, the speed of light. Which of the following gives the speed of the object in terms of the other quantities? 

x² -14x + 40 = 2x + 1
What is the sum of the solutions to the given equation?

What is the y-intercept of the graph of y = 4^x in the xy-plane?

What is the area. in square units, of the figure shown?

In the given equation, b is a constant. If the equation has infinitely many solutions, what is the value of b ?

Which of the following is an equation of the line in the xy-plane that contains the points (1, 3) and (5,15)?

Which of the following expressions is equivalent to the given expression, where x -2?

(x³ + x) (x² -x)
Which of the following is equivalent to the given expression?

Aracely can spend up to a total of $20 on streamers and balloons for a party. Streamers cost $1.49 per pack. and balloons cost $4.39 per pack. Which of the following inequalities represents this situation, where s is the number of packs of streamers Aracely can buy, and b is the number of pack of balloons Aracely can buy? (Assume there is no sales tax.)

The function f is defined by f(x) = x² - 5x + 6. What is the value of f (4)?