How to find x of this rhombus

x=7

36+36=72

adjacent angles of a rhombus is 180

15x+3+72=180

75+15x=180

15x=180-75

=105

x=105/15

=7

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

a variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !