Answer:
1. A 2.C 3. C
Explanation:
To find the total number of pencils produced over four years, you can multiply the annual production by the number of years:
Annual production = 1.8 x 10^6 pencils per year
Number of years = 4
Total production = Annual production x Number of years
Total production = (1.8 x 10^6 pencils/year) x 4 years
Now, calculate the total production:
Total production = 7.2 x 10^6 pencils
So, the total number of pencils produced over four years is 7.2 x 10^6 pencils.
To multiply the two numbers in scientific notation, you can multiply the significant figures and add the exponents of 10:
(8 x 10^(-2)) * (2.4 x 10^(-3)) = (8 * 2.4) x 10^((-2) + (-3))
Now, calculate the multiplication of the significant figures and the addition of the exponents:
(8 * 2.4) x 10^((-2) + (-3)) = 19.2 x 10^(-5)
So, the result is 19.2 x 10^(-5) in scientific notation.