Options -
−1≤x<0

1≤x≤2

0
−1≤x≤5

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Which of the following contains a variable?

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! )