Option A: 4 is the solution
Explanation:
The given expression is 
We need to determine the solution of the expression.
<u>Solution:</u>
The solution of the expression can be determined by solving the expression for t.
Let us solve the given expression.
Applying the log rule, if
then 
Thus, we have;

Adding both sides of the equation by 4t, we get;

Adding both sides of the equation by 3, we have;

Dividing both sides of the equation by 5, we get;

Hence, the value of t is 4.
Therefore, the solution of the given expression is 4.
Thus, Option A is the correct answer.
Answer:
The answer is A.
Step-by-step explanation:
Because the square root of 42 is about 6 and those two numbers are close to 6.
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Answer:
He will earn $6 in interest in 9 months.
Step-by-step explanation:
This is a simple interest problem.
The simple interest formula is given by:

In which E is the amount of interest earned, P is the principal(the initial amount of money), I is the interest rate(yearly, as a decimal) and t is the time.
After t years, the total amount of money is:

Initial deposit of $400.
This means that 
2% annual interest
This means that 
How much interest will he earn in 9 months?
An year has 12 months, this means that 
This is E. So

He will earn $6 in interest in 9 months.
Answer:
$29
Step-by-step explanation:
You divide 2.5 by 100 the you multiply that by 725 and sense its months it would be converted to 1.6 so you multiply 725 1.6 and the answer to 2.5 divide by 100