I think you meant to type
4(n)-5=7.
4n = 7 + 5
4n = 12
n = 12/4
n = 3
He ANWSER I got would be c idk if this is right or not I honk it might be
Answer:
0.579 is the probability that a household has a VCR given they have a TV.
Step-by-step explanation:
We are given the following in the question:
Probability of all households have a TV = 88% = 0.88

Probability of all households have a TV and VCR = 51% = 0.51

We have to find the probability that a household has a VCR given they have a TV.
The conditional probability is given by:

0.579 is the probability that a household has a VCR given they have a TV.
Answer: 25
Assuming the dotted line touches the middle of the base of the triangle,
Using Pythagoras Theorem,
(30/2)^2 + (20)^2 = x^2
x^2 = (15)^2 + 400
x^2 = 625
x = √625 or -(√625)
x = 25 or -25
But since x needs to be a positive value,
x = 25