Answer:
Mary is 10 years old, and her father is 40 years old.
Step-by-step explanation:
Let Mary's age = x.
Mary's father is four times as old, so he is 4x.
Five years ago, Mary was x - 5, and her father was 7(x - 5).
Five years ago, Mary's father was 4x - 5.
7(x - 5) = 4x - 5
7x - 35 = 4x - 5
3x = 30
x = 10
4x = 4 * 10 = 40
Mary is 10 years old, and her father is 40 years old.
Answer:
Step-by-step explanation:a or b ?
Answer:
nt ooooo
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Step-by-step explanation:
Answer:
a)
And if we solve for we got:
b) False
The reason is because we don't satisfy the following relationship:
We have that:
c) False
In order to satisfy independence we need to have the following condition:
And for this case we don't satisfy this relation since:
Step-by-step explanation:
For this case we have the following probabilities given:
Part a
We want to calculate the following probability:
And we can use the total probability rule given by:
And if we solve for we got:
Part b
False
The reason is because we don't satisfy the following relationship:
We have that:
Part c
False
In order to satisfy independence we need to have the following condition:
And for this case we don't satisfy this relation since: