Answer:
Show us the equation
Step-by-step explanation:
Could you put a screenshot of it
may i see the picture?lol
Amount of Niobium-91 initially
= 300/91 =3.2967mol
2040 years = 3 ×680 = 3 half-lives
therefore, amount left = 0.4121mol
mass of Niobium-91 remaining = 0.4121 ×91 =37.5g
Please give brainliest
1) 3x(3x-1)
2)5(9x^2-3x+1)
