Shelly biked 21 miles in 4 hours

If Shelly biked 21 miles in 4 hours. To find out how many miles she biked in 1 hour just divide.

21 ÷ 4 = 5.25

So, she biked

5.25 of 5 1/4 miles per hour

Hope this helps.

i think it is x = 1.2

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