The cost of an anti-virus software package is $90 for the first year and $15 for each annual renewal. If the independent variable is the number of annual renewals and the dependent variable is the total amount paid, what
is the slope and y-intercept of the graph of the equation representing this situation?
А
The slope is 75, and the y-intercept is 90.
68
B
The slope is 90, and the y-intercept is 15.
/
С
The slope is 15, and the y-intercept is 90.
D
The slope is 90, and the y-intercept is 75.
US

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

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