Your friend can clap his hands 28 times in 12 seconds. how many times can your friend clap his hands in 2.25 minutes?

Step-by-step explanation:

x / 2.25 seconds = 28 times / 12 seconds

multiply by sides by 2.25 seconds

x / 2.25 seconds * 2.25 seconds = 28 times / 12 seconds * 2.25 second

x = 2.3333333  times/ second * 2.25 seconds

x = 5.8333

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

d

step-by-step explanation: