1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vodomira [7]
3 years ago
7

This equation shows how the time required to ring up a customer is related to the number of items being purchased. t = 4p + 20 T

he variable p represents the number of items being purchased, and the variable t represents the time required to ring up the customer. If it takes 44 seconds to ring up a customer, how many items are being purchased?
Mathematics
1 answer:
konstantin123 [22]3 years ago
4 0

Answer:

6 items are being purchased

Step-by-step explanation:

Given that  variable p represents the number of items being purchased, and the variable t represents the time required to ring up the customer, If it takes 44 seconds to ring up a customer then the number of items being purchased may be computed by substituting the value of t into the given equation

t = 4p + 20.

Using t = 44

44 = 4p + 20

collect like terms or subtract 20 from both sides

44 - 20 = 4p

24 = 4p

Divide both sides by 4

24/4 = p

p = 6

You might be interested in
What is -12 + (-4) + (-17) ??
Ludmilka [50]

Answer:

The answer is -33

Step-by-step explanation:

7 0
1 year ago
Help please asap I will mark you brainlist
grin007 [14]

Answer:

1/ -2.65

2/ 1/8

3/ 14.28

4/ -7.9

Step-by-step explanation:

Just add and subtract.

4 0
3 years ago
Which answer choice is correct?
lana66690 [7]
I’m pretty sure it is A
5 0
3 years ago
Round 8.36 to the nearest one decimal place
BartSMP [9]
8.4 because 6 would round up to 10 and 10+30 =40 for 8.40 or just 8.4
4 0
3 years ago
Suppose that you are in charge of evaluating teacher performance at a large elementary school. One tool you have for this evalua
Strike441 [17]

Answer:

a) Standard error = 2

b) Range = (76.08, 83.92)

c) P=0.69

d) Smaller

e) Greater

Step-by-step explanation:

a) When we have a sample taken out of the population, the standard error of the mean is calculated as:

\sigma_m=\dfrac{\sigma}{\sqrt{n}}=\dfrac{10}{\sqrt{25}}=\dfrac{10}{5}=2

where n is te sample size (n=25) and σ is the population standard deviation (σ=10).

Then, the standard error of the classroom average score is 2.

b) The calculations for this range are the same that for the confidence interval, with the difference that we know the population mean.

The population standard deviation is know and is σ=10.

The population mean is M=80.

The sample size is N=25.

The standard error of the mean is σM=2.

The z-value for a 95% confidence interval is z=1.96.

The margin of error (MOE) can be calculated as:

MOE=z\cdot \sigma_M=1.96 \cdot 2=3.92

Then, the lower and upper bounds of the confidence interval are:

LL=M-t \cdot s_M = 80-3.92=76.08\\\\UL=M+t \cdot s_M = 80+3.92=83.92

The range that we expect the average classroom test score to fall 95% of the time is (76.08, 83.92).

c) We can calculate this by calculating the z-score of X=79.

z=\dfrac{X-\mu}{\sigma}=\dfrac{79-80}{2}=\dfrac{-1}{2}=-0.5

Then, the probability of getting a average score of 79 or higher is:

P(X>79)=P(z>-0.5)=0.69146

The approximate probability that a classroom will have an average test score of 79 or higher is 0.69.

d) If the sample is smaller, the standard error is bigger (as the square root of the sample size is in the denominator), so the spread of the probability distribution is more. This results then in a smaller probability for any range.

e) If the population standard deviation is smaller, the standard error for the sample (the classroom) become smaller too. This means that the values are more concentrated around the mean (less spread). This results in a higher probability for every range that include the mean.

6 0
3 years ago
Other questions:
  • What will be the area ?
    5·2 answers
  • Cut 9ft piece into 12inch & Every cut remove 1/8 inch
    8·1 answer
  • Use the formula d=rt to find the value of the missing variable.
    6·1 answer
  • Help fast big bonus if get right due soon !!
    6·2 answers
  • Find the terms, coefficients, and constants of 4x+x+17
    9·2 answers
  • Solve for x 4(x+9)= 3(2x - 7)​
    12·2 answers
  • Which one is better ketchup or mustard
    10·1 answer
  • Just give me the answer
    10·1 answer
  • Evaluate the function f(x) = -7x + 2 at f(-18).
    6·1 answer
  • A company, ABC, wants to produce Graphing Calculators. The equipment rental costs are $150 per month and the parts for the calcu
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!