Write an algebraic expression that illustrates the additive identity. Which property is illustrated? 15 + (5 + 7) = (15 + 5) + 7

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Given sin∅ = 1/3 and 0 < ∅ < π/2 ; find tan2∅ a. (4√2)/9 b. 9/7 c. (4√2)/7 d.7/9