Question

If a = 4.5 x 10-5 and b = 1.5 x 10-6 then value a = b corrected to significant figures is
Select one:
O a. 0.30
O b. 3.0
O c. 3.0 10
O d. 30
Could some one answer this question for me

Answer 1

Answer:

Oa.0.30 a pls mark me brainliest

Answer 2

Correct question: If a = 4.5 x $10^{-5}$ and b = 1.5 x $10^{-6}$, then value of a ÷ b corrected to significant figures is:

Select one:

a. 0.30

b. 3.0

c. 3.010

d. 30

The correct answer is option (d). 30.

Given:

a = 4.5 x $10^{-5}$

b = 1.5 x $10^{-6}$

To Find:

To find the value of a ÷ b corrected to significant figures, we must know what a significant figure is.

Significant figures are the number of digits in a value that contributes to its degree of accuracy.

Solution:

a ÷ b = (4.5 x $10^{-5}$) ÷ (1.5 x $10^{-6}$)

= $\frac{4.5×10^{-5} }{1.5× 10^{-6} }$

= $\frac{4.5×10^{-5}×10^{6} }{1.5 }$

= $\frac{4.5×10^{6-5}}{1.5 }$

= $\frac{4.5×10^{1}}{1.5 }$

= $\frac{4.5}{1.5 }$ × $10$

= $3$ × $10$

= $30.$

The number of significant figures in 30 is 2.

Hence, the value of a ÷ b corrected to significant figures is 30.

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