Tell whether the graph of the quadratic function y=-x^2-10x+1 opens upward or downward.
a. because , the parabola opens upward.
b. because , the parabola opens downward.
c. because , the parabola opens upward.
d. because , the parabola opens downward.

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.