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lesya [120]
3 years ago
12

If 12 cars are needed to get 36 students to the end of the road with their packs, how many cars will be needed to get 9 students

to the end of the road ?
Mathematics
1 answer:
Solnce55 [7]3 years ago
7 0

Answer:

3 cars

Step-by-step explanation:

3*3 = 9

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4 0
3 years ago
Elijah buys 5 pens and 4 pencils for $18.50. He may also buy 3 pens and 6 pencils for $16.50. How much does one pen cost?
Feliz [49]
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8 0
3 years ago
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alexandr402 [8]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
A company has developed a new type of light bulb, and wants to estimate its mean
BARSIC [14]

Answer:

628

Step-by-step explanation:

We have the standard deviation of the sample, so we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 12 - 1 = 11

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 11 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.2

The margin of error is:

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The answer is 628

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3 years ago
Chaz needs $4.77 for new batteries. He has $2.80. How much more money does he need?
Vadim26 [7]

Answer:

1.97

Step-by-step explanation

2.80 + n=4.77

4.77 - 2.80= 1.97

8 0
3 years ago
Read 2 more answers
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