Solve the Equation: 10 = 1(x-19)

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?