18) the answer is 3 because CD is a segment bisector that seperates both AB and BD into 2 congruent segments.And perpendicular lines form right angles.
19) the answer is 1 because the S represents AB is congruent to BD. Then, A represents the right angles: angle ADC and angle BDC. Lastly. S is represented by the common side which is segment CD.
Rational expressions are multiplied and divided the same way numeric fractions are.
It's scientific notation, so 1.4x10^7 would be 14000000 <span />
11/2 / 3 = 11/6 pounds per friend
divide 11/2 pounds by 3 in order to get answer