At which root does the graph of F(x) = (x + 4) 6(x + 7,5 cross the x-axis ? O-7 04 O4 O 7

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?