Answer=D, Y=55x + 4. This is the answer.......
Btw: this is my first answer I done ;)
Answer:
x=2, y=3.
Step-by-step explanation:
0.2x + 0.3y = 1.3
0.4x + 0.5y = 2.3
From the first equation y = (1.3 - 0.2x) / 0.3
Substituting in second equation:
0.4x + 0.5(1.3 - 0.2x) / 0.3 = 2.3
Multiply through by 0.3:
0.12x + 0.5(1.3 - 0.2x) = 0.69
0.12x + 0.65 - 0.1x = 0.69
0.02x = 0.04
x = 2.
Substituting for x in equation 1:
0.2* 2 + 0.3y = 1.3
0.4 + 0.3y = 1.3
0.3y = 1.3 - 0.4 = 0.9
y = 3.
Check in equation 2:
0.4 * 2 + 0.5(3) = 0.8 + 1.5 = 2.3.
- Correct.
The teacher has to take 10 questions at a time from 12 questions.
Total ways = 12C10 = 12!/(10!)(12-10)! = 12 x 11 / 2 = 66
The teacher can make 66 different exams
Answer:
The probability that a particular death is due to an automobile accident is 2.72%
Step-by-step explanation:
The probability can be calculated as the percentage of each particular death.
The formula for this case is:
P(car accident) = (Number of death due a car accident / Total of deaths) * 100
P(car accident) = (24/883)100 = 2.72%
Probabilities of each particular death:
Automobile accident = (24/883)100 = 2.72%
Cancer = (182/883)*100 = 20.61%
Heart disease = (333/883) * 100 = 37.71%
