Each square on the grid represents 1 yd2.

what is the approximate area of this pond?

a.
about 10 yd2 to 20 yd2

b.
about 30 yd2 to 40 yd2

c.
about 50 yd2 to 60 yd2

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

The sum of two numbers is 86, and their difference is 20. find the two numbers

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