A scientist has 20 grams of the radioactive isotope sodium-24. The isotope decays exponentially as shown in the table. Time (hours) Mass (grams)
5 15.9
10 12.6
15 10
20 7.9
25 6.3
30 5

Approximately what will the mass of the isotope be after 45 hours?
A. 1.5 grams
B. 2.5 grams
C. 3.5 grams
D. 4.5 grams

Martha needs 22.25 strawberries for every 5 smoothies she makes. complete the table to see how many strawberries she would need to make 10 smoothies and 20 smoothies.

Which is a true statement comparing the graphs of x^2/6^2-y^2/8^2 = 1 and x^2/8^2-y^2/6^2 the foci of both graphs are the same points. the lengths of both transverse axes are the same. the directrices of = 1 are horizontal while the directrices of = 1 are vertical. the vertices of = 1 are on the y-axis while the vertices of = 1 are on the x-axis.

Three cylinders have a volume of 2836 cm^3. cylinder a has a height of 900 cm. cylinder b has a height of 225 cm. cylinder c has a height of 100 cm. find the radius of each cylinder. use 3.14 as an approximate for π