A maintenance man has 12 keys on his key ring. if he tries the keys at random on a storage room door, discarding those that do not work, what is the probability that he will get the door open on his 4th try?

What are the coordinates of the vertex of the parabola y = x² + 4x - 6? ((4, - 6) (-2 - 10) (2, 6) (-4, 6)

Simplify the expression. 7y+3x+3-2y+6 What is the coefficient of y What is the constant

The relative growth rate for a certain type of bacteria population is 85% per hour. A small culture has formed and in just 2 hours the count shows to be 12,500 bacteria in the culture. What is the initial number of bacteria in the culture?

Are the equations m+3=-5 and m=-2 equivalent. Why?

What is the value of y in the solution to the following system of equations? 2x + y = - 4 5x + 3y = - 6 Answer for Blank 1:

Center c of the circle above has coordinates of (4, 3). what is the circumference of the circle?

The perimeter of a rectangle is 68 cm. The length is 4 cm more then it's width. Find the dimensions of the rectangle

Dave buys a baseball for $15 plus an 8% tax. Mel buys a football for $20 plus an 8$ tax. How much did each person pay?

Simplify (-80/-20) -4 4 -40 40

Suppose that the following relations are defined on the set A = {1, 2, 3, 4}. R1={ (2,2), (2,3), (2,4), (3,2), (3,3), (3,4) }, R2={ (1,1), (1,2), (2,1), (2,2), (3,3), (4,4) }, R3={ (2,4), (4,2) }, R4={ (1,2), (2,3), (3,4) }, R5=