What would be the area of these shapes mentioned below? A circle, with a cirmufrnece of 9.5 cm
A circle witha circumfrnece of 11.5 cm
A circle with a dimater of 6cm
A circle witha circumfrence of 15cm
A cricle with a cirmcumfrence of 21cm
A semi-circle, with a radius of 6cm
A semi-circle, with a radius of 9cm
A semi cicle with a dimater of 20 cm

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

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

The graph of y x3 is translated so that the point (1. 1) is moved to (1, 4). what is the equation of the new graph?