Suppose pr(a)=0.25 and pr(b)=0.48, where a and b are mutually exclusive. find pr(a ? b).
pr(a ? b)=
(simplify your answer. type an integer or a decimal.)

 The required value is P(A ∪ B) = 0.73.

Step-by-step explanation:  Given that A and B are two mutually exclusive events where

We are to find the following probability :

P(A ∪ B).

We know that

the intersection of two mutually exclusive events is null event. That is,

A ∩ B = ∅     ⇒  P(A ∩ B) = 0.

From the laws of probability, we have

Thus, the required value is P(A ∪ B) = 0.73.

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w