Answer:
Total number of trees planted = [tex]7\times 10^{5}[/tex] trees
Step-by-step explanation:
Trees planted by each student = [tex]2\times 10^2[/tex]
Total number of students = [tex]3.5\times 10^3[/tex]
Using unitary method to find total number of trees planted by all the students in school.
1 student plants = [tex]2\times 10^2[/tex] trees
[tex]3.5\times 10^3[/tex] student would plant = [tex](2\times 10^2)\times (3.5\times 10^3)[/tex]
We apply the product rule of exponents to multiply [tex][a^xa^y=a^{x+y}][/tex]
⇒ [tex](2\times 3.5)\times(10^2\times 10^3)[/tex]
⇒ [tex]7\times 10^{2+3}[/tex]
⇒ [tex]7\times 10^{5}[/tex] trees
Total number of trees planted = [tex]7\times 10^{5}[/tex] trees
