A number between 30 and 50 is chosen at random. What's the probability that the number contains at least one 4

the required probability is 0.5789

Step-by-step explanation:

total number between 30 and 50 = 31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49

number containing at least one 4 = 34, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49

So, we have total 19 numbers between 30 and 50 and total 11 numbers with at least one 4

So, probability of atleast one 4 = (favorable)/(total outcome) = 11/19 = 0.5789

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3