Ex (1) A straight line
P (2,-3) and R61,6)
passes through
the points
Find (I) the length of PR to idp.
(ii) the gradient of PR
(ii) the coordinate of the mid point of PR
Ciul the equation of another PR
(v) the equation of another line which
parallel to PR
and passes through
point k Co,-7)
is
the

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

What is the difference between the predicted value and the actual value

What line represents the relationship between r and s