I don’t understand this

it means that

y–x+6.8= 7.2–(–2)+6.8

–(–) will change into +

=7.2+2+6.8

=7.2+2.0+6.8

=16

Please mark me as Brainliest

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .