In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Gloria has scored 89, 81, and 83 on the first three. What range of scores on the fourth test will give Gloria a C for the semester (an average between 70 and 79, inclusive)? Assume that all test scores have a non-negative value.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte