David is standing 500 feet away from the base of a cell phone tower. The angle of elevation from his eyes to the top of the tower is 78 degrees. If David’s eyes are 6 feet above the ground, how tall is the tower?

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?

How can constraints be used to model a real-world situation?

What is the value of x? assume that the line is tangent to the circle.