Professor Curie is using the radioactive isotope Francium-223 in her research. This isotope has a half-life of 22 minutes, which means that every 22 minutes the sample has half the radioactivity it did in the previous interval. If Professor Curie has 15 grams of Francium-223, which explicit formula describes how the isotope decays? A. an=22(0.5)^15-1
B. an=22(0.5)^n-1
C. an=15(0.5)^n-1
D. an=15(22)^n-1

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?

Multiply and simplify. 2x2y3z2 · 4xy4x2 how to do?

Consider the function f left parenthesis x right parenthesis equals 4 x squared minus 3 x minus 1f(x)=4x2−3x−1 and complete parts (a) through (c). (a) find f left parenthesis a plus h right parenthesis f(a+h); (b) find startfraction f left parenthesis a plus h right parenthesis minus f left parenthesis a right parenthesis over h endfraction f(a+h)−f(a) h; (c) find the instantaneous rate of change of f when aequals=77.