Answer:
The second one (4+3x = 9)
Step-by-step explanation:
From the working we can already tell that the second one is the odd one out without even doing the 4th one
600+4 is 604 in expanded form
Answer:
≈ 16 g
Step-by-step explanation:
Half life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half of its initial mass.
Therefore;
New mass = Original mass × (1/2)^n, where n is the number of half lives
Thus;
New mass = 125 × (1/2)³
= 125/8
= 15.625
≈ 16 g
Answer:
This shape has no rotational symmetry.
Explanation:
Shapes with rotational symmetry have the property of looking the same after being rotated a degree smaller than 360.
Although this shape in the image does have symmetry, it does not have rotational symmetry because there is no way for it to look the exact same after being rotated.
I hope this helps!
