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kozerog [31]
3 years ago
12

ralph opened up a checking account with $100. on monday he withdrew $45 to purchase a pair of jeans. on wednesday he deposited a

$25 check he recieved for his birthday. on friday he used his debit card to buy a $98 football ticket. write expression to describe total change of ralphs checking balance..then determine the integer that represents the final balance.
Mathematics
1 answer:
Vitek1552 [10]3 years ago
3 0

100-45+25-98=$-18 in his bank account

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When solving a word problem, what step should you always do after reading the problem, but prior to writing the equation?
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Properly identifying and assigning the proper variables to each part of the problem before attempting to solve it
4 0
3 years ago
Suppose that the probabilities are 0.4, 0.3, 0.2, and 0.1, respectively, that 0, 1, 2, or 3 power failures will strike a certain
defon

Answer:

mean = 1 power failure

variance = 1 (power failure)²

Step-by-step explanation:

Since the mean is computed as

mean = E(x) = ∑ x * p(x) for all x

then for the random variable x=power failures , we have

mean = ∑ x * p(x) = 0 * 0.4 + 1* 0.3 + 2*0.2 + 3* 0.1 = 1 power failure

since the variance can be calculated through

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but easily in this way

variance = E(x²) -  [E(x)]² , then

E(x²) = ∑ x² * p(x) = 0² * 0.4 + 1²* 0.3 + 2²*0.2 + 3²* 0.1 = 2 power failure²

then

variance = 2 power failure² - (1 power failure)² = 1 power failure²

therefore

mean = 1 power failure

variance = 1 power failure²

7 0
3 years ago
3. Which one of the following is an arithmetic sequence?
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Hi,

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7 0
2 years ago
Pine bluff middle school is having its annual spring fling dance which will cost $475 the student treasure reported that the dan
Cloud [144]
4t + 75 => 475, t = 100

Is this what you were looking for?
5 0
3 years ago
Can you help with this one: Dorthy Katz, a computer programmer, earns regular hourly rate of 32.25 and time and a half when she
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