Question

PLEASE HELP AS FAST AS POSSIBLE PLEASE HELP PLEASE

Answer 1

Answer:

option C

Step-by-step 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

$\frac{8 \cdot 10^{-5}}{64 \cdot 10^7}$

Apply exponential property

a^m divide by a^n  is a^ m-n

$\frac{8}{64} =0.125$

$\frac{10^{-5}}{10^7}=10^{-12}$

$0.125 \cdot 10^{-12}= 1.25 \cdot 10^{-13}$

Answer 2

Answer:

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