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Jet001 [13]
3 years ago
10

What is the unit rate and state rate of 253 for 20 hours?

Mathematics
1 answer:
Vilka [71]3 years ago
6 0
The unit rate is 12.65 per hour. 
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Jessica brought a cooler to the family picnic filled with 32 cans of regular soda and 18 cans of diet soda. What is the ratio of
natta225 [31]

Answer:

ratio of regular to diet soda = 16/9

Step-by-step explanation:

Jessica brought a cooler to the family picnic filled with 32 cans of regular soda and 18 cans of diet soda. This means

Number of cans of regular soda = 32

Number of cans of diet soda = 18

Total number of soda brought to the family picnic = number of cans of regular soda + number of cans of diet soda

= 32 + 18= 50

the ratio of regular soda cans to diet cans in the cooler= 32/18

Divide numerator and demo minator by 2, we have 16/9.

The fraction cannot be reduced further. So ration of regular to diet soda = 16/9

8 0
3 years ago
Question 2 Evaluate the expression 2(x - 3) + 3y when x = 5 and y = 3. Mark the correct answer.
8_murik_8 [283]

Answer:

A. 13

Step-by-step explanation:

2(x - 3) + 3y

2(5 - 3) + 3×3

2× 2 + 3×3

4 + 9

13

7 0
2 years ago
Read 2 more answers
In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were o
ad-work [718]

The question is incomplete. Here is the complete qeustion.

In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained: 0.10 0.13 0.16 0.15 0.14 0.008 0.15

(a) Construct a 99% confidence interval for the mean nitrogen-oxide emissions of all cars.

(b) If the EPA requires that nitrogen-oxide emissions be less than 0.165 g/mi, based on the 99% confidence interval in (a), can we safely conclude that this requirement is being met?

Answer: (a) 0.089 ≤ μ ≤ 0.171

(b) No

Step-by-step explanation:

(a) To determine the confidence interval, first calculate the mean (X) and standard deviation (s) of the sample

X = \frac{0.1+0.13+0.16+0.15+0.14+0.08+0.15}{7}

X = 0.13

s = \sqrt{\frac{(0.1-0.13)^{2} + (0.13 - 0.13)^{2} + ... + (0.15 - 0.13)^{2}}{7-1} }

s = 0.029

The degrees of freedom is

N - 1 = 7 - 1 = 6

And since the confidence is of 99%:

α = 1 - 0.99 = 0.01

α/2 = 0.01/2 = 0.005

The t-test statistics for t_{6,0.005} is 3.707

(Value found in the t-distribution table)

Now, calculate Error:

E = t_{6,0.005} . \frac{s}{\sqrt{N} }

E = 3.707. \frac{0.029}{\sqrt{7} }

E = 0.041

The interval will be:  

0.13 - 0.041 ≤ μ ≤ 0.13+0.041

0.089 ≤ μ ≤ 0.171

(b) No, because according to the interval, the nitrode-oxide emissions range from 0.089 to 0.171, which is greater than required by EPA.

7 0
3 years ago
Simplify the above question​
ankoles [38]

Answer:

0.75417552

reduced equals 0.75

Step-by-step explanation:

log(55/2)

log(81)

Decimal Form: 0.7541755

this answer is the anser if you are dividing log 10 and 27 1/3 by log 10 81

6 0
3 years ago
Macy bought a total of 12 fiction and non-fiction books. The fiction books cost $12 each and the
Masja [62]

Answer:

fiction books = 4

non fiction books = 8

non fiction books are twice fiction books.

Step-by-step explanation:

let number of fiction books be X so

non fiction books will be 12-X

12X + 25(12-X) = 248

12X -25X = -53

X = 4( fiction books)

12-4 = 8 (non fiction)

4 0
2 years ago
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