Cheryl ran three laps during her physical education class. If her times were 1.23 minutes, 1.04 minutes, and 1.18 minutes, what was her average lap time? A. 1.21 minutes
B. 1.19 minutes
C. 1.21 minutes
D. 1.17 minutes

The sum of two numbers is 86, and their difference is 20. find the two numbers

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2