Shelia simplified an expression using the following steps. which property justifies step 3? Step 1: 5x + 4(3+2x)
Step2: 5x + 12 + 8x
Step3: 5x + 8x + 12
Step4: 13x+12

A. Identity property
B. Associative property
C. Distributive property
D. Commutative property

Can someone explain the elimination method to me for this problem?

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

Use the four functions below for this question. compare and contrast these four functions using complete sentences focus on the slope and y- intercept first, and then on any additional properties of each function