Carol's first grading period has ended. There were six test scores for the grading period; however, she did not record two of her scores. She knows the two unrecorded test scores are the same. The scores she did record were 92, 84, 86, and 94. What score did she earn on each of the two tests if her average score for the period is 90? A. 91
B.90.5
C. 92
D. 91.5

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c

Angel entered a triathlon (a three-part race). he swam 1 mile, rode his bike 30 miles, and ran 10 miles. how far did he go altogether? a. 11 miles b. 123 miles c. 41 miles d. 40 miles

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60