In the metric system, land area is measured in hectares. A hectare (ha) is 100 meters (m) x 100 m, 10,000 m². In the United States, land area is most commonly expressed in acres. There are 2.47 acres in 1 ha. The conversion from hectares is relatively easy to do without a calculator;
rounding to two significant figures gives 2.5 acres in 1 ha.

If a natural preserve is 100 ha, what is the size in acres? 100 ha x 2.5 acres/ha = 250 acres.

Let's try another problem, how many acres in 157 ha? (one decimal place) acres

Now let's convert to hectares.
A particular forest is 10,000 acres. Determine the size if hectares.
ha

Which rational number could be graphed between -4 and -5

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

This is so hard and it’s for a test