Simplify the expression. 5 + 10 – 2 • 3 9 39 29 19

9

Step-by-step explanation:

Orders of operation tells us we have to multiply or divide first, whichever one comes first from left to right; then we add or subtract from left to right.  It looks like we have a 2*3 which is 6.  That changes our expression to

5 + 10 - 6,

which is 15 - 6 which is 9

4

step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)