Answer:
A
Step-by-step explanation:
the speck of dust is very small,
using the smallest unit out of all the choices, mm, is the best way to rewrite it
choice A
SOLUTION
At the same time t,
Train 1 would have covered a distance of 80t, since distance = average speed x time.
Train 2 would have covered a distance of 70t.
Now both added should give 210 miles
That is 80t + 70t = 210
150t = 210
t = 210/150
t = 1.4 hours
Alright so we're not trying to solve the equation but kind of get to its core.
8(h-1)=6h+4+2h
Let's first use the distributive property:
8(h-1) would be 8h-8
Now let's add our like terms:
6h+4+2h would be 8h+4
So now we got 8h-8=8h+4
We can finally start isolating the variable (h):
8h-8=8h+4
- 8 8
________
h h
Now we got h-8=h+4
This is your final answer.