Please help me asap!!

Step-by-step explanation:

sin a = 4/5 then cos a = 3/5

sin b = 12/13 then cos b = -5/13 (because in quadrant 2)

then

cos (a+b) = cos a cos b - sin a sin b

cos (a+b) = 3/5 * (-5/13) - 4/5 * 12/13

cos (a+b) = -3/13 - 48/65

cos (a+b) = -15/65 - 48/65

cos (a+b) = - 63/65

cos (a+b) = -63/65

in decimal -0.969 ≈ -0,97

describing distributions is one of the key skills you’ll need to earn a high score on the ap statistics exam. if you need proof of this, just flip through some past exam questions, which can be found at the collegeboard website. you’ll notice that the first free response question is almost always a question requiring you to look at a graph and describe it.

step-by-step explanation: just trying to get points sorry : (