La masa de una muestra inicial X miligramos de estroncio-90 luego de t años sigue la formula m(t)=X*(0.5)^(t/29). ¿La masa disminuye o aumenta con el paso del tiempo?

the two may have that, even a breakdown is probably offered

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

just sum

10 + 10 = 20

7.9m and 4.3°

step-by-step explanation:

let east be +x and north be +y, x = distance * cos θ, y = distance * sin θ  

for 3.5 south, y = -3.5  

for 8.2, x = 8.2 * cos 30 and y = 8.2 * sin 30  

for 15 west, x = -15  

total x = 8.2 * cos 30 – 15 ≈ -7.9  

total y = -3.5 + 8.2 * sin 30 = 0.6  

magnitude = [(8.2 * cos 30 – 15)^2 + 0.6^2)]^0.5  

the magnitude is approximately 7.9 m  

tan θ = y/x = 0.6/-7.9  

the angle is approximately 4.3˚ north of west