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victus00 [196]
3 years ago
12

If P( A or B) = 2/5, P(B)=1/4 and P( A and B) = 1/10 find P(A)

Mathematics
1 answer:
natulia [17]3 years ago
5 0

Answer:

p(a) = -3/20

Step-by-step explanation:

p ( a +b) = p(a)+p(b)

1/10= p(a) +1/4

1/10 - 1/4 = p(a)

p(a) = -3/20

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Please help if you can! :)
mina [271]

9514 1404 393

Answer:

  A. no solution

  B. unique solution: (x, y) = (0, 0)

Step-by-step explanation:

For these problems, you can subtract the second equation from the first to get something of the form ...

  0 = (expression)

The solution of that will tell you the answer.

__

A. (2x +3y) -(2x +3y) = (4) -(9)

  0 = -5 . . . . . . . . no values of x or y will make this true: NO SOLUTION

__

B. (y) -(y) = (6x) -(x)

  0 = 5x

  0 = x . . . . . . divide by the coefficient of x.

  y = x = 0

The unique solution is (x, y) = (0, 0).

5 0
2 years ago
I don't know how to do this someone pleasr help me
mars1129 [50]
Alright finding the mean of the set is pretty simple,
first add all the numbers that you were given.
0+2+3+4+6+6+7 add these up
28 then you need to divide them by
you divide by 7 because that's how many numbers you have
28 divided by 7 equals 4
so Sandy is correct.  
3 0
3 years ago
Read 2 more answers
To the nearest whole number, what is the surface area of a sphere with a volume of 140 cm3?
lara [203]
The answer should be 130 cm2
7 0
3 years ago
Read 2 more answers
H(x) = 17 + x/6 h(-18) = ___<br> x/6 is a fraction <br> please helpp
gayaneshka [121]
Simply plug in the value for x.

If x is equal to -18, then plug in -18 for x.

Example:

f(x) = 15 + x/5. 
f(5) = 15 + 5/5.

Then solve the equation.

A function is just something that receives some value and then barfs a value out. This is an IO relationship. (Input/Output).
6 0
3 years ago
A farmer pumps water from an irrigation well to water his field. the time it takes to water the field varies inversely with the
Mila [183]
In order to answer this question, we use the concept of ratio and proportion wherein we use the equation,
                                 R1 / T2 = R2 / T1
where R is for rate and T is for time. Substituting the known values to the equation,
                                 (600)/x = (400)/ 20
The value of x from the equation is 30. Thus, it will take 30 hours if the rate was adjusted to 400 gallons per minute. 
8 0
3 years ago
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