Mr Harrison is 9 months old. How old is Mr Harrison daughter in days

Simplify the expression. -2/5(10+15m-20n)

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.