The half-life of the radioactive substance is 67.95 hours.
We are asked in this problem the surface area of the prism given the dimensions: <span>9mm by 12mm by 8mm. Surface area is the sum of the areas of each face of the prism. The formula for surface area is 2*lw+2*lh+ 2*wh. In this case, upon substitution, SA = 2*9*12+2*9*8+2*12*8 equal to a total of 552 mm2. </span>
Answer:
The square of a monomial is 
Step-by-step explanation:
Consider the provided monomial.

We need to Write the expression as a square of a monomial.
The above expression can be written as:



Hence, the square of a monomial is 
Just do 7/4 and cross multiply with 1/2