Describe how to use a tens fact to find the difference for 15-8 2nd grade

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Find the value of x. give reasons to justify your solutions! c ∈ ae

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! )