Answer:
Step-by-step explanation:
For a first order decay, fraction remaining = 0.5n where n = number of half lives elapsed.
fraction remaining = 55% = 0.55
0.55 = 0.5n
log 0.55 = n log 0.5
-0.2596 = -0.301 n
n = 0.8625 = # of half lives elapsed
0.8625 half lives x 2.5 billion years/half live = 2.16 billion years have elapsed = age of the rock
b) 0.15 = 0.5n
log 0.15 = n log 0.5
-0.824 = -0.301 n
n = 2.74 half lives
2.5 billion years/half life x 2.74 half lives = 6.85 billion years = age of rock
Answer:
k = 
Step-by-step explanation:
The equation of proportionality is
y = kx ← k is the constant of proportionality
y = x ← is in this form
with k =
Answer:
B.)21.4
Explanation
A(-4, 3), B(0,2), C(2,4) and D(0,-3)
AB = √(1²+4²) = √17 =4.12
BC = √(2²+2²) = √8 = 2.83
CD = √(2²+7²) = √53 = 7.28
AD = √(4²+6²) = √52 =7.21
Perimeter = 4.12+2.83+7.28+7.21 = 21.44
To the nearest tenth the answer is 21.4.
Area: 9•6= 54ft sq Perimeter 9+9+6+6= 30ft
Answer:
3^2 · 3^4 · 3^6 (you keep bases) ( you add exponents)
C) 3^12
QUESTION 2:
What value is equivalent to 5^2 · 5^2? (5^4) 5×5×5×5 ...25×25
D) 625
QUESTION 3
(−6)3 (-6)×3
A) −18
QUESTION 4
Evaluate: −94
A) −36
B) −6,561
C) 36
D) 6,561
( not really sure what is asking to do ? )
