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SVEN [57.7K]
3 years ago
12

HELP THIS HURTS MY BRAIN!

Mathematics
1 answer:
harkovskaia [24]3 years ago
8 0
Meal was $25
Tip was $2
Total spent was $27
$9 x 3 = $27
No Missing Buck
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A factory dumps an average of 2.43 tons of pollutants into a river every week. if the standard deviation is 0.88 tons, what is t
vovikov84 [41]
25.8%  
First, determine how many standard deviations from the norm that 3 tons are. So:
 (3 - 2.43) / 0.88 = 0.57/0.88 = 0.647727273  
So 3 tons would be 0.647727273 deviations from the norm. Now using a standard normal table, lookup the value 0.65 (the table I'm using has z-values to only 2 decimal places, so I rounded the z-value I got from 0.647727273 to 0.65). The value I got is 0.24215. Now this value is the probability of getting a value between the mean and the z-score. What I want is the probability of getting that z-score and anything higher. So subtract the value from 0.5, so 0.5 - 0.24215 = 0.25785 = 25.785%  
So the probability that more than 3 tons will be dumped in a week is 25.8%
5 0
3 years ago
Tina spends 5/6 of an hour exercising every day. Today, she has already exercised for 3/5 of an hour. How much more time should
zaharov [31]

Answer: 14 minutes

Step-by-step explanation:

in the attachment

5 0
3 years ago
Merchandise is ordered on November 10; the merchandise is shipped by the seller and the invoice is prepared, dated, and mailed b
natali 33 [55]

Answer:

November 13

Step-by-step explanation:

Following dates are given

On November 10 = Merchandise ordered

Date of an invoice prepared, dated and mailed = November 13

Date when the merchandised received by the buyer = November 18

So, the credit period begins when the invoice is prepared, dated and the mailed by the seller to the buyer as it is the evidence of that the merchandise is ordered            

4 0
3 years ago
Marco borrowed $150 from his brother.He has paid him back 30% so far.How much money does Marco still owe his brother?
alexdok [17]
150*30% = $45
$150-$45 = $105

Marco still owes his brother $105
8 0
3 years ago
Read 2 more answers
In the expression 5x + 15 = 150, you can start solving the problem
Gnoma [55]

Answer:

i think 2x

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
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