Question

PLEASE HELP AS FAST AS POSSIBLE PLEASE HELP PLEASE

Evaluate 0.00008 ÷ 640,000,000.

A) 1.25 × 10 -15

B) 1.25 × 10 -14

C) 1.25 × 10 -13

D) 1.25 × 10 -12

Answer 1

0.00008 ÷ 640,000,000 means

8*10^-5 ÷ 6.4*10^8

so let's collect to simplify the operation

(8÷6.4)*(10^-12) -5-7=-12

then the answer becomes 1.25×10^-14 that is B

Answer 2

option C

Explanation:

Evaluate 0.00008 ÷ 640,000,000.

0.00008 can be written in standard notation

Move the decimal point to the end

so it becomes
`8 \cdot 10^(-5)`

for 640,000,000 , remove all the zeros and write it in standard form

`64 \cdot 10^7`

Now we divide both

`(8 \cdot 10^(-5))/(64 \cdot 10^7)`

Apply exponential property

a^m divide by a^n is a^ m-n

`(8)/(64) =0.125`

`(10^(-5))/(10^7)=10^(-12)`

`0.125 \cdot 10^(-12)= 1.25 \cdot 10^(-13)`