Which equation can be used to find the measure of angle BAC?

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Someone me! if you’re smart you can solve this!