Mrs Hassan gave her Year 8 class a test on Friday. The highest possible mark for the test was 10.
The results are shown below.
20
a) How many pupils scored more
than 7 in the test?
15
b) How many pupils are there in
Mrs Hassan's Year 8 class?
Number of pupils
010
5
c) What assumption have you
made in answering part b)?
LI
0 1 2 3 4
5 6 7 8 9
10 Test mark

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

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

Acircle has a circumference of 28.36 units what is the diameter of the circle