the ages of rocks can be determined using the isotope 135cs, which undergoes beta decay with a half-life of 2.3×106 y. a rock sample contains a ratio of 135ba to 135cs of 0.15. given that 135ba is a stable product of the beta decay of 135cs, and assuming there was originally no 135ba present in the rocks, calculate the age of the rock sample.

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Felipe is saving money for a class trip. he already has saved $ 2 5 0 $250 that he will put toward the trip. to save more money for the trip, felipe gets a job where each month he can add $ 3 5 0 $350 to his savings for the trip. let m m be the number of months that felipe has worked at his new job. if felipe needs to save $ 2 7 0 0 $2700 to go on the trip, which equation best models the situation?

Explain how you might determine the rate of weathering on a sample rock