The half–life of rubidium–89 is 15 minutes. if the initial mass of the isotope is 250 grams, how many grams will be left after 100 minutes?

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y

Answer asap! due in 30 minutes! ! 8th grade math

The sum of two consecutive mile markers on the interstate is 417417. find the numbers on the markers