How could you find 3/8% of 800

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

Find two numbers if their sum is 91 and the ratio is 6: 7?

Find each value of the five-number summary for this set of data. [note: type your answers as numbers. do not round.] 150, 120, 136, 180, 158, 175, 124, 162 minimum maximum median upper quartile lower quartile