Which quadrilateral will always have 4- fold reflectional symmetry

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

What is the inverse of the function f(x) = 2x + 1?

Alice is paying her bill at a restaurant. but tax on the cost of a male is 5%. she decides to leave a tip 20% of the cost of the meal plus the tax