Use the area of rectangle formula which is:
Given that:
- area of rectangle = 16
- width = 8
- length = x-5
Substitute in the formula:
Distribute 8 in the expression:
Move -40 to another side and change from -40 to 40.
Then move 8 to divide 56, leaving only x.
Hence, the answer is:
Lets split the box in pieces and then add:
top = 20*15 = 300
sidesA = 2*20*9 = 360, is multiplied by 2 cause there are 2 sides like this
sidesB = 2*9*15 = 270, is multiplied by 2 cause there are 2 sides like this
so in total we have:
total = 300 + 360 + 270 = 930 cm^2
if we express this quantity in mm^2 we have:
<span>1cm² = 100 mm²</span>total = 930*100 = 93000 mm^2
so if the tiles are 5 mm^2 we need:
total tiles = <span>93000/5 = 18600
we need 18600 tiles of 5 mm^2</span>
If we are simplifying, ⅜ ab³a⁴ is
⅜a^5b³. when multiplying like bases you add exponents
second is xy²/2. when dividing like bases you subtract exponents
1 7/9 divided by 2/9 is 8 hunny hope it helps ^_^
