Answer:
800 m
Step-by-step explanation:
1 km = 1,000 m
8 km = 8,000 m
1 hour = 60 minutes
6 minutes is 1/10 of an hour
1/10 of 8,000 m = 800 m
Answer: 800 m
If Dan is 8x years old next year then he must be 8x-1 years old this year
With the same logic, five years ago from this year, he must be 8x-1-5=8x-6
The answer should be 8x-6
The answer of this is 3,6,9,12,15,18,21,24,27,30,33,36,39,...
What must be true is the expression will actually be adding 10 + (+ x), because of the two marks you have to make when subtracting by a negative.
The subtraction sign is also the negative sign. So in this case, the expression is also saying -x, which means there is two negative signs.
A double negative is a positive, so in this case the x will be turned to a positive integer.
If this is still too confusing, she can plug in a number to replace x. Let’s try it with -2:
Ex. 10 - (-2)= 12.
The two negative signs turn into one positive sign, AKA an addition sign. So, the above expression can be simplified as 10 + 2, or 12.
