Answer:
approximately 27 grams
Work Shown:
Half life formula
y = A*(0.5)^(x/H)
where,
A = starting amount = 30 grams
H = half life period = 90 years
x = number of years that pass by = 12
y = amount left over after x years
Let's plug the values for x, A and H into the formula to find y
y = A*(0.5)^(x/H)
y = 30*(0.5)^(12/90)
y = 27.3516746567466
y = 27 .... rounding to the nearest whole number
Answer:
A. x
Step-by-step explanation:
1. Simplify parentheses

2. Divide by 13

3. Basic math (
)

Answer:
2j+1
Step-by-step explanation:
Circle the first symbol in front of the j's and 1's
Answer:
24 + 5b -b²
Step-by-step explanation:
i am not sure what is meant by propert/ identity but
8 x 3 = 24
8 x b = 8b
(-b) x 3 = (-3b)
(-b) x b = (-b)²
24 + 8b + (-3b) + (-b)²
24 + 5b - b²