The half-life of the radioactive substance is 67.95 hours.
Answer:
26
Step-by-step explanation:
Angles that form a linear pair are supplementary, and thus have measures that add to 180 degrees.
4x+3+2x+21=180
6x+24=180
6x=156
x=26
More than likely the answer is 68 square <span>centimeters</span>
8 1/3 is equivalent to 25/3
2 2/3 is equivelent to 8/3
25/3-8/3 so you take away 8 from 25 and you get, 17 therefore, the answer is 17/3 or 5 2/3.
Hope this helped.
Have a nice day.
Each time the value of n increases by 1, the value of an increases by a factor of 3. The 3rd choice is appropriate.
_____
When an expression like this one is written in plain text, it is appropriate (required) to put parentheses around the exponent that contains an arithmetic operation.
an = 4·3^(n-1)
If you leave off the parentheses, the expression no longer describes a geometric sequence.