Cesium-137 has a half life of approximately 30 years. How much of a 40 g sample would be left after 90 years?

A. 14.33 g

B. 6.31 g

C. 32.49 g

D. 5 g

E. 26.67 g

5

Step-by-step explanation:

30 years => 20

60 years => 10

90 years => 5

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: