Mrs. long just got a new puppy! the puppy is learning how to run on hard wood floors. the puppy is running at a rate if 4 feet per second straight toward a wall that is 20 feet away. select all that apply to this situation. the y-intercept is 4 ft since the puppy is running at a rate of 4 feet per second. the y-intercept is 20 ft because the puppy is 20 feet away from the wall. the puppy will run into the wall after 5 seconds. the slope is 4 ft per second since this is how fast the puppy is running. the slope is -4 ft per second since the puppy is running at a rate of 4 ft per second.

The puppy will run into the wall after 5 seconds and the slope is 4 ft per second since this is how fast the puppy is running.  

Step-by-step explanation:

The answer choices to this question are assuming that the relationship between the quantities being measured are linear.  In a linear equation, the slope represents the rate of change.  In this case, the rate is 4 feet per second, so the slope is 4 ft/sec since this is how fast the puppy is running.  In a linear equation, the y-intercept represents the initial, or starting, value.  Although the wall is 20 feet away, the puppy starts from a distance of zero (0) and would end at a distance of 20 feet.  In the linear equation, the 20 feet would represent the total ('y') not the y-intercept.  If 20 ft is the total, our equation would be: 20 = 4x, which means x = 5 which is the number of seconds it would take the puppy to run into the wall.

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a