Suppose laboratory has a 26-gram sample of polonium-210.the half-life in polonium-210 is about 138 days.
a. How many half-lives of polonium-210 occur in 276 days?
b. How polonium is left in the sample after 276 days?

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

answerim :

n

step-by-step explanation:

im not sure but my dad knows

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct