Answer:
x=7
Step-by-step explanation:
Step 1: Subtract 4x from both sides.
x+30−4x=4x+9−4x
−3x+30=9
Step 2: Subtract 30 from both sides.
−3x+30−30=9−30
−3x=−21
Step 3: Divide both sides by -3.
−3x
−3
=
−21
<u><em>The sides of a rhombus are all congruent (the same length.)</em></u>
32 cm²
6*4+ 1/2*4*4= 32 cm²