350 cm^2 (A for connections academy)
Answer:
D
Step-by-step explanation:
In parallelogram, opposite angles are congruent.
m∠B = m∠D
3x = x + 52 {Subtract x from both sides}
3x - x = 52 {Combine like terms}
2x = 52 {Divide both sides by 2}
x = 52/2
x = 26
m∠B = 3x = 3*26 = 78
[all of the above] 15kg box moving at same speed as 10kg box obviously has more inertia/energy and ogbects in motion will keep going at same velocity until acted upon by an outside force such as friction or it slamming into stuff and such
