Abag contains yellow marbles and blue marbles, 80 in total. the number of yellow marbles is 4 less than 5 times the number of blue marbles. how many yellow marbles are there?

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

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab