Please help quick will mark brainliest

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

Which number completes the inequality? 2/3 < _ < 7/9

Ahmed plans to add a rectangular sunroom to his house. the sunroom will have a length of 14 feet and a width of 10 feet, and the construction will cost $40 per square foot. how much more would the sunroom cost if it’s width were increased to 12 feet?