Because empty set has no element which automatically make it a subset of every set.
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Make bottom numbers same
they should be 40
to kee p fractions the same multiply topo and bottom by same number
3/8 times 5/5=15/40
1/5 times 8/8=8/40
15/40+8/40=23/40
Answer:
Positive
Step-by-step explanation:
(-9)-3=27
(-9)-2=18
(18)(27)=486
<span>A small cell has a large Surface are/volume ratio and therefore can exchange molecules with it's external environment rapidly.
Here, we can see the ratio is 6:1, which is very large ratio, so it will transport very rapidly. Thus, it denotes that cell can easily get the material it needs that move across it's surface
Hope this helps!</span>
A) x2 + 8x + 16
= x2 + 4x + 4x + 16
= x(x+4) + 4(x+4)
= (x+4)(x+4) these are the equations of the two sides - they are the same because it is square. So the equation of one side is 1x + 4
b) The perimeter is the sides all added together, so that is
x+4+x+4+x+4+x+4 = x+x+x+x+4+4+4+4
= 4x+16 or 4(x+4)
c) When x=8 then the the perimeter is 4 lots of 8+4 inches which is 1 foot. 4 lots of 1 is 4, so the perimeter is 4 feet.
2) The difference of two squares can be written in the form x2 - y2. This can be written as (5n)2 -20, but because 20 is not a square number it can't be written as something-squared.
