29) 1/2
30) 3/5
31) 3/4
32) 8/10 equal 4/5
33 not sure
Answer:
Step-by-step explanation:
Total number of balls = 3 + 2 = 5
1)
a)
b)
c)
Probability of at least one black( means BB or BW or WB)
d)
Probability of at most one black ( means WW or WB or BW)
2)
a) Probability both black without replacement
b) Probability of one black and one white
c) Probability of at least one black ( BB or BW or WB)
d) Probability of at most one black ( BW or WW or WB)
If you add them straight down:
2d-e = 7
d + e = 5
Then the e's cancel out.
You are left with 3d = 12
Then solve for d by dividing each side by 3.
Now you have d =4.
To solve for e go back into one of your original equations and substitute 4 for the d.
You can use either equation, so I'll choose the second one.
4 + e = 5
Now solve for e by subtracting each side by 4.
Now you have e = 1.
So your solutions are d = 4 and e = 1
Just count the zeros at the left. In your case <span>6
</span> so your number equals <span><span>0.428⋅<span>10<span>−6</span></span></span>
</span> and in scientific <span>4.28⋅<span>10<span>−<span>7</span></span></span></span>
