The probability is 0.1253.
This is binomial because 1) there are two outcomes (either do or do not use in class); 2) the events are independent of each other (the probability of one person using a phone in class does not affect the probability of another person doing this); and 3) there is a fixed number of trials (9).
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Hi,
Work:
Equation;

Collect like terms and calculate sum of positive numbers.

Move constant +63 to the right side and change its sign.

Subtract numbers.

Divide both sides of equation with 13.

Hope this helps.
r3t40
Answer:
A = $1,120 B = $5120
Step-by-step explanation:
1.4/100 = 0.014
0.014 x 4000 = 56
1.4% interest on the $4,000 is $56.
56 x 20 (years) = 1,120
A= $1,120
To get B simply add 1,120 to 4000.
1,120 + 4000 = 5120
B = 5120.
OMIGOSH!! I have this same book, ok I'm past this chapter so. Tell me the page and I'll refresh my memory to help.