Here's a graph of a linear function. write the
equation that describes that function.
express it in slope-intercept form.

  y = 3/4x +2

Step-by-step explanation:

The line crosses the y-axis at 2, so that is the y-intercept. The line appears to have a rise of 3 for a run of 4, so rise/run = slope = 3/4.

The slope-intercept form of the equation of a line is ...

  y = (slope)x + (y-intercept)

  y = 3/4x + 2

(a) we multiply the individual probabilities ( because they are independent):-

answer = 0.95626^2 = 0.91443

(b) this is 0.95626^7 = 0.73119

(c) Prob(at least one does not live until 4 years old) = 1 - Prob( all seven will live until 4 years old) = 1 - 0.73119 = 0.2688.

it would not be unusual for the last probability to happen - its a chance of about 1 in 4.