Answer:3
Step-by-step explanation:because from cm to km you have to divide by 100,000 to get km from cm so 300,000/100,000=3
Answer:
0.7
Step-by-step explanation:
7 x 0.10
=> 7 x 0.1
=> 7 x 1/10
=> 7/10
=> 0.7
Answer:

Step-by-step explanation:
Given:

add all together with exponents
=48*290
= Then turn into a smaller exponent
= 
combine like terms

=
Because there is no number that when multiplied by itself that could equal to 10 (ex: 16 is a perfect square because 4 and 4 multiplied together equals 16; 4 and 4 are the same number)