The sum of two numbers is 46 and the difference is 2

Which table represents a linear function? i'll give brainliest to first answer ^'^

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! )

Acircle has a radius of 12.6cm what is the exact length of an arc formed by a central angle measuring 120