Carlos spent 1 1/4 hours doing his math homework. he spent 1/4 of his time practicing his multiplication facts. how many hours did carlos spend practicing his multiplication facts?

11/4 = 2 hours and 45 minutes

1/ 4 = 0.25 hour = 15 minutes

so he studied for 2 hours and 30 minutes and practiced for 15 minutestotal time = 2 hours and 45 minutes.

hope it helped !

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