Answer:
-1
Step-by-step explanation:
The weight of the cell phone is given by:
[tex]W=2.8*10^n[/tex]
The options provided for 'n' are:
a. -3
b. -1
c. 0
d. 1
Applying the possible values:
[tex]W_a=2.8*10^{-3}\\W_a = 0.0028\ pounds\\\\W_b=2.8*10^{-1}\\W_b = 0.28\ pounds\\\\W_c=2.8*10^{0}\\W_c = 2.8\ pounds\\\\W_d=2.8*10^{1}\\W_d = 28\ pounds[/tex]
A cellphone could not possibly weigh as little as 0.0028 or as much as 2.8 or 28 pounds. Therefore, the most reasonable value for n is -1.
Answer:
(B)-1
Step-by-step explanation:
Let us plug in the given values into [tex]2.8X10^n[/tex][tex]2.8X10^{-3}=2.8X 0.001=0.0028\:Pounds\\2.8X10^{-1}=2.8X 0.1=0.28\:Pounds\\2.8X10^{0}=2.8X 1=2.8\:Pounds\\2.8X10^{1}=2.8X 10=28\:Pounds[/tex]
A reasonable value for the weight of a cell phone will be 0.28 Pounds.
Therefore, n=-1
