The amount of the substance (At) at any time t is calculated through the equation,
At = (A0)(e^-kt)
where A0 is the initial amount and k is constant.
For the half-life,
ln (At / A0) = ln 0.5 = -k(5270 years)
The value of k is 1.3153x10^-4 / year.
Substituting this value to the same equation, where At = 0.25A0
ln 0.25 = -(1.3153 x 10^-4)(t)
The value of t from this equation is 10540 years. The closest value to this is letter A.
we know that
area larger triangle (DEF)=[scale factor]²*area smaller triangle (ABC)
solve for scale factor
scale factor=√[area larger triangle/area smaller triangle]
scale factor=√[144/100]------> scale factor=1.2
therefore
measure EF=scale factor *measure BC
solve for measure BC
measure BC=measure EF/scale factor-------> 15/1.2------> 12.5 cm
the answer is
measure BC is 12.5 cm
Answer: -6/3+1/3
Step-by-step explanation: Just solve all the problems until you find one that is not the same answer :)
Answer:
- story 1- B and story 2-A
- x and y is the amount of flyers she gave to each volunteer.
- 3x+12=90 3y+36=90
- x= 26 y=18
3x+12=90
3x+12-12=90-12
3x=78
3x/3=78/3
x=26
3y+36=90
3y+36-36=90-36
3y=54
3y/3=54/3
y=18
I hope this is good enough:
Answer:
The slope:
Step-by-step explanation:
-To determine the slope of the following points shown, you need this formula:
(
represents the slope, 
represents the first coordinate and 
represents the second coordinate)
-Apply the following points to the formula:
Then, solve:
So, the slope is 
.
