If the product of two positive fractions a and b is 15/56 find three paris of possible values for a and b

That will be easy. It could be 12/56+3/56 or, 7/56+8/56 or, 10/56+5/56.

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

step-by-step explanation:

this is not possible to solve with the info given.   you need at least an one angle somewhere.