Jamal is calculating his cell phone bill. He pays $15.99 per month plus $.50 per long distance call. As a sign up bonus, his phone provider is deducting $5.99 from his bill this month. if Jamal made 23 long distance calls this month, how much is his total phone bill? Use the expression m + .50n - b, when m is the monthly rate, n is the number of long distance calls, and b is the bonus.

Assume that a population of 50 individuals has the following numbers of genotypes for a gene with two alleles, b and b: bb = 30, bb = 10, and bb = 10. calculate the frequencies of the two alleles in the population’s gene pool.

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

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.