Answer: 
Step-by-step explanation:
We know that Scientific notation is a way to write a very large or a very small number in the product of a decimal form of number [generally between 1 and 10] and powers of ten.
Given number : 0.00023
In scientific notation 
Therefore, In scientific notation 
The value of x is 1
Step-by-step explanation:
According to the problem
625 = 
or, 
=
By the rule of index
4 = 6 - 2x
or, 2x = 6 - 4
or, 2x = 2
or, x = 1
Answer:
18
Step-by-step explanation:
because if you add 18 and 17 its 35
The answer for the first question is D.
here's why: John goes 60 miles an hour so to go 240 miles is 4, and to 30 miles is 30 minutes. so that would mean it would take him 4.5 hours ( 4 hours and 30 minutes. )
The answer to the second question is C.
here's why: since each of the workers mow at the same speed, there's no need to worry about the 9. now you just need to divide 45 by 10 ( 4.5 ) to see how many lawns he mows in an hour ( 4.5 )
