What is the constant of variation for the relationship shown in the table?
x 1 2 3 4
y 5 10 15 20

a.1
b.2
c.3
d.5

answer:

d.5

step-by-step explanation:

5 times every number keeps the constant a five

for example five 5*2 =10   ,,

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