Substitute x=2y -2 into the expression 5x +4 and determine the first step

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

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

Negative 5 1/12 + negative 4 1/4 + 6 3/4