What is the value of the expression below written in scientific notation?

(4.2 • 10^2)(2 • 10^3)

A. 840,000
B. 8.4 • 10^5
C. 8,400,000
D. 8.4 • 10^6

Question

What is the value of the expression below written in scientific notation?

(4.2 • 10^2)(2 • 10^3)

A. 840,000 
B. 8.4 • 10^5
C. 8,400,000
D. 8.4 • 10^6

anonymous · Answer

i cant really help but try khan its really good i use it all the time

anonymous · Answer

am good with exponents decimals an fractions

anonymous · Answer

message me back ^

anonymous · Answer

if u have any of those i can help

jim_thompson5910 · Answer

what is 4.2 times 2 equal to?

anonymous · Answer

8.4 ?

jim_thompson5910 · Answer

good, now you add the exponents over the 10s

so 2+3 = 5

this means that the answer is 

$$\large 8.4 \times 10^{5}$$

anonymous · Answer

how do you do the exponents? like typing like that? it doesnt let me. and thanks
!

anonymous · Answer

example 10^5

jim_thompson5910 · Answer

you can use the equation button below the text input bar to type in equations and math expressions like $\large x^3$

anonymous · Answer

but if its on something not on open study then it would have to b 1^5