Write an equation in slope -intercept form of the line through point p(6,-1) with slope 4

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

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.