I have no idea where to even start. He gave us a 4 minute long video explaining absolutely nothing.

x=3.6

Step-by-step explanation:

The triangles are similar meaning they are proportional, think like a ratio. So the one side is 1 and its proportional side is 20. That means you take a side of the small triangle and multiply by 20 to get the corresponding side on the large triangle. So, the small side x-3, multiply it by 20 to get the larger side.

20(x-3)=4x-2

20x-60=4x-2

16x=58

x=3.6

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

the ratio of white tiles to blue tiles is 48: 16. the ratio in it's simplest form is 3: 1.

step-by-step explanation:

ratio: take the first number and add a colon next to it, then add the second number after that. make sure the ratio order matches up with the written problem!

simplest form: we can simplify the ratio 48 : 16 by dividing both terms by the greatest common factor (gcf).

the gcf of 48 and 16 is 16.

divide both terms by 16:

48 ÷ 16 = 3

16 ÷ 16 = 1

reducing to simplest form:

48 : 16 = 3 : 1