Question

ABCD is a parallelogram in which A = 4x+15 and C= 5x+4 find angle A

Answer 1

we know in a llgm opposite sides are equal
take,
A=C and you will got your answer

Answer 2

we know that parallelogram's opposite are equal so,
A=C=>4x+15=5x+4=>15-4=5x-4x=>11=x
then,angle A = 4 * 11 + 15 = 44+15=59