Help on here too plz there’s more in my acc I need help on all

Find the value of the cosine for angle a

Δabc is dilated by a scale factor of 3 with the origin as the center of dilation to form δa′b′c′. the slope of is -1.2. the length of is p units, the length of is q units, and the length of is r units. the slope of is . the length of is units.

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.