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

irrational, cannot

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°