Astring of christmas tree lights has 15 lights what is the probability that the defective light is the 3rd from the plug

Bring the fraction a/a-4 to a denominator of 16-a^2

Need asap. solve for the following inequality

Identify the slope an intercept of the following linear equation y = 1/5x - 6 a. slope: 1/5; intercept: -6 b. slope: 5; intercept: -6 c. slope: -1/5; intercept: 6 d. slope: 1/5; intercept: 6