Answer:
or 
Step-by-step explanation:
To solve this problem you must:
- Convert the mixed numbers to fractions, as following:


- Multiply both fractions. Mutilply the numerators and the denominators:

- Simplify. Therefore, you obtain that the answer is:
or 
Answer: b) -0.625
<u>Step-by-step explanation:</u>
The formula for the z-score is:

If a^ x = b then:
x = log_{a}b
For:
4^{7} = 16384 \\ log _{4}16384 = 7
Given:
Beginning Balance: 2,447.67
Less: Withdrawal <u> 231.49</u>
Total 2,216.18
Add: Credit to acct <u> 36.61</u>
Ending Balance <u> 2,252.79
</u>The new balance is $2,252.79<u>
</u>