Triangle abc is shown below:

given: δabc

prove: all three angles of δabc add up to 180°.

the flowchart with missing reason proves the measures of the interior angles of δabc total 180°:

which reason can be used to fill in the numbered blank space?

a. associative property of addition
b. triangle exterior angle theorem
c. angle addition postulate
d. commutative property of addition

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Simplify the following expression 48^1/2