Choose the word from the list that best matches each sentence.
equation identity solution variable
1. A placeholder for an unknown number.
2. A value of the variable that makes the equation true.
3. A mathematical sentence that states two quantities are equal.
4. A mathematical sentence that is true for every value.
5. In the equation x + 12 = 34, x is a.

In the past, professional baseball was played at the astrodome in houston, texas. the astrodome has a maximum height of 63.4 m. the height of a baseball t seconds after it is hit straight up in the air with a velocity of 45 ft/s is given by h = -9.8t2 + 45t + 1. will a baseball hit straight up with this velocity hit the roof of the astrodome? use the discriminant to explain your answer.

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

The function below show how much jayna and hannah charge for babysitting. which statement best compares the two plants?