In this question, it is given that
A certain bacteria culture grows at a rate of 18% everyday. There are currently 420 bacteria.
And we have to find number of bacterias on day *.
For that we use the following formula


Substituting these values in the formula, we will get

THerefore on day 8, number of bacterias are 1579.
Answer:
Fraction
Step-by-step explanation:
Part A) $520
Part B) 13.33% - Divide 520 by 39
Part C) $20.80 Divide 520 by 100, then multiply by 4
You're Welcome
C) It doesn’t satisfy either the top or bottom equations.
When we plug them into the top equation:

Simplify:

Because the statement of -23 = -15 is wrong, the solution pair is wrong for the top equation.
When we plug them into the bottom equation:

Simplify:

9 = -8 is not a valid statement, so the pair doesn't satisfy both of the equations.