4. suppose a laboratory has a 31 g sample of polonium-210. the half-life of
polonium-210 is about 138 days.
a. how many half-lives of polonium-210 occur in 966 days?
b. how much polonium is in the sample 966 days later?

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

£56

step-by-step explanation:

u divide 24 by 3 and u get 8 so if u do 8 time 7 or 8+8+8+8+8+8+8 u get 56 and 56 divided by 7 is 8.

need more info

step-by-step explanation:

24

step-by-step explanation: