Dividing the parallelogram in half and applying trigonometry is the easiest solution for me.
3x+4=10
Subtract 4 from both sides
3x=6
Divide both sides by 3
X=2
Sides = 10,10,5
Problem 5. 4x+1=29
Subtract 1 from both sides
4x=28
X=7
<span>c. Peter walks at a rate of 13/4 miles per hour.</span>