What would this be and explain it too.

Graph the equation. select integers for x

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )