I do not understand what you are saying.

june=6 months, 6*8.75=52.5

250-52.5 = $197.5?

106 because you need to find smallest 3 digit multiple of 7, then add 1

shortest:7

2nd shortest:6

3rd shortest:5....

tallest:0

7+6+5+4+3+2+1+0=28

I would know this literally happened to me.

simplify

2n-18-1=1

2n-19=1

add 19

2n=20

divide by 2

n=10

(I'm new to this, so get a secon opinion:)

variables on one side, constaints on other side,

13x-6x=104+8

7x=112

divide by 7

x=16.

(I think, I'm only in 7th grade and I'm new to this,so I'm not as smart as CPhill, so try to get a second opinion)

2) 7^1 ones digit=7

7^2 ones digit=9

7^3 ones digit=3

7^4 ones digit=1

7^5 ones digit=7

loop of 4, 2018 is congruent to 2(mod 4)

7^2018 ones digit=9