b. t~39 days

Question

asked 2021-05-02

If 20% of the \(\displaystyle{89}^{{{S}{r}}}\) remains in the body after 90 days, write a function of the form \(\displaystyle{Q}{\left({t}\right)}={Q}{0}{e}^{{−{k}{t}}}\) to model the amount Q(t) of radioactivity in the body t days after the initial dose.

b. what is the biological half-life of 89^Sr under this treatment? Round to the nearest tenth of a day.

asked 2021-09-22

If 20% of the \(\displaystyle{89}^{{{S}{r}}}\) remains in the body after 90 days, write a function of the form \(\displaystyle{Q}{\left({t}\right)}={Q}{0}{e}^{{−{k}{t}}}\) to model the amount Q(t) of radioactivity in the body t days after the initial dose.

b. what is the biological half-life of \(89^{Sr}\) under this treatment? Round to the nearest tenth of a day.

asked 2021-05-09

The table shows the number of students in a school's beginning and advanced orchestra classes. The student pay a fee for instruction books: $5 for brass, $5 for woodwinds, and $8 for strings. Find the amount each class will spend on books. Brass Strings Woodwinds amp; Advanced amp;12amp;22amp;18amp; Beginning amp;28amp;25amp;30
Brass
Strings
Woodwinds
amp; Advanced
amp;12
amp;22
amp;18
amp; Beginning
amp;28
amp;25
amp;30

asked 2021-05-01

The following definition is discussed in advanced mathematics courses.

\(f(x)=\begin{cases}0 & if\ x\ is\ a\ rational\ number\\1 & if\ x\ is\ an\ irrational\ number \end{cases}\)

Evaluate \(f(-\frac{3}{4}), f(-\sqrt{2}),\ and\ f(\pi) \).