Find measure of angle d a. 122 degrees b. 61 degrees c. 238 degrees d. not enough information

What is the slope of the line shown below?

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

I'm confused on this could anyone me and show me what i need to do to solve it.