1) 2m/s = 2*18/5 =7.2Km/h
2)In 3 hour, he would travel, 7.2*3 = 21.6Km.
Answer:

Step-by-step explanation:
Given

Required
Rewrite using scientific notation, then find n

Express as fraction

This can be splitted to

The first number must be between 1 and 10; hence, 25 can be expressed as 2..5 * 10

Apply law of indices


Comparing n, the given options

Answer:
19.1
Step-by-step explanation:
27 is half of 54, so that means that the second triangle is 1/2 the size of the first, meaning all sides need to be divided by 2 in order to get the answers for each side
Answer:
7.9230
Step-by-step explanation:
Combine like terms
115 = 13x+12
103 = 13x
7.9230 = x
Hope that helps