Use reciprocal tables to find the value of [tex](0.325)^{-1}[/tex]. Hence, evaluate [tex]\left(\frac{3 \sqrt{0.0000125}}{0.325}\right)[/tex]. Give your answer to 4 significant figures.

(3 marks)



Answer :

Sure! Let's solve the given problem step-by-step.

### Step 1: Find the Reciprocal of 0.325
The reciprocal of a number [tex]\( x \)[/tex] is given by [tex]\( \frac{1}{x} \)[/tex].

For [tex]\( x = 0.325 \)[/tex]:
[tex]\[ 0.325^{-1} = \frac{1}{0.325} \approx 3.0769 \][/tex]
So the reciprocal of 0.325 is approximately 3.0769.

### Step 2: Evaluate [tex]\(\sqrt{0.0000125}\)[/tex]
We need to calculate the square root of 0.0000125.

[tex]\[ \sqrt{0.0000125} \approx 0.0035355 \][/tex]

### Step 3: Substitute Values Into the Expression
Now, we substitute the values we have into the expression [tex]\(\left(\frac{3 \sqrt{0.0000125}}{0.325}\right)\)[/tex]:
[tex]\[ \left(\frac{3 \times 0.0035355}{0.325}\right) \][/tex]

### Step 4: Simplify the Expression
First, multiply the number inside the parentheses:
[tex]\[ 3 \times 0.0035355 = 0.0106065 \][/tex]

Then, divide by 0.325:
[tex]\[ \frac{0.0106065}{0.325} \approx 0.0326357 \][/tex]

### Step 5: Round the Result to 4 Significant Figures
Finally, we round the result to 4 significant figures:
[tex]\[ 0.0326357 \approx 0.03264 \][/tex]

### Answer
Thus, the value of [tex]\( (0.325)^{-1} \)[/tex] is approximately [tex]\( 3.0769 \)[/tex], and the value of [tex]\(\left(\frac{3 \sqrt{0.0000125}}{0.325}\right) \)[/tex] to 4 significant figures is approximately [tex]\( 0.03264 \)[/tex].