Answer this it's for my math test and i need to pass it's for court

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

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?