Let the smaller number be n:
Therefore 1/2 * n(n+1) = 105
n^2 + n = 210
n^2 + n - 210 =0
Use your preferred method to solve the quadratic, I'll factorise this since this is easy to factorise.
Two numbers':
product gives -210
summation gives 1
Therefore (n+15)(n-14)=0
So the smaller number n is either -15 or 14.
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Hello!
To do this you see how many times 5 goes into 7. As you can see it only goes in once. This gives us a whole number one. Since we took away 5 we have two sevens left. This gives us the mixed number below.

I hope this helps!
Answer:
80,000
Step-by-step explanation:
The 8 in the expression = 8,000
If we multiply 8,000 by 10 it would give us 80,000
easy :)
The total length of her drive is 83 miles.
If 21 miles=1/3 of her drive, then multiply 21 by 3, to figure out 3/3 of her drive.