Notice that 45 hours is 3 times the half-life of 15 hours.
After the first 15 hours, 450 g decays to half this amount, 225 g.
After the next 15 (total 30), 225 g decays to 112.5 g.
After the next 15 (total 45), 112.5 g decays to 56.25 g.
Answer:
x=150
y=240
Step-by-step explanation:
*Use simultaneous equation solving
1.Label your equations
x+y=390......1
2x+4y=1260......2
*make one of the unknowns subject of formula, to form equation 2
x=390-y.....3
*sub.3 into 2
2(390-y)+4y=1260
780-2y+4y=1260
2y+780=1260
y=240
sub. y into 3
x=390-y
x=390-240
x=150
Answer:
Third option is correct
Step-by-step explanation:
Given:
To choose: the correct option
Solution:
Multiply both sides by - 1
For , it includes all numbers less than
The graph is as follows:
Answer:
1/3 of a chance or 0.3
Step-by-step explanation:
(y-14)(y+14). You just square root 196