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vladimir1956 [14]

2 years ago

14

at a restaurant, Trevor decides to tip the server 16% of the bill. If he leaves $4.00 tip, which proportion could be used to fin

d how much the bill was for?

2 answers:

Kazeer [188]2 years ago

5 0

4\25 is the proportion of the percentage

Molodets [167]2 years ago

5 0

Answer:

16/100 = 4/x

Step-by-step explanation:

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In measuring reaction time, a psychologist estimates that a standard deviation is .05 seconds. How large a sample of measurement

blondinia [14]

Answer:

97

Step-by-step explanation:

We are asked to find the size of sample to be 95% confident that the error in psychologist estimate of mean reaction time will not exceed 0.01 seconds.

We will use following formula to solve our given problem.

$n\geq (\frac{z_{\alpha/2}\cdot\sigma}{E})^2$ , where,

$\sigma=\text{Standard deviation}=0.05$ ,

$\alpha=\text{Significance level}=1-0.95=0.05$ ,

$z_{\alpha/2}=\text{Critical value}=z_{0.025}=1.96$ .

$E=\text{Margin of error}$

$n=\text{Sample size}$

Substitute given values:

$n\geq (\frac{z_{0.025}\cdot\sigma}{E})^2$

$n\geq (\frac{1.96\cdot0.05}{0.01})^2$

$n\geq (\frac{0.098}{0.01})^2$

$n\geq (9.8)^2$

$n\geq 96.04$

Therefore, the sample size must be 97 in order to be 95% confident that the error in his estimate of mean reaction time will not exceed 0.01 seconds.

5 0

2 years ago

solve this system of linear equations separate the x and y values with a comma -14x=-7-7y -10x=-15-7y

gizmo_the_mogwai [7]

X=7/4+7/4y ,y∈ (One symbol I can't find but that's what I got)

7 0

2 years ago

Read 2 more answers

Leilah has not yet

Ivenika [448]

Answer:

40 * x - 600 = 0

Step-by-step explanation:

The first thing is to identify the variable (x) of the equation and they will be the number of days that Leilah will take to read her flashcards. Now if you need to study 600 out of 2400, it is because you have read 1800. Therefore we have to:

2400 - 1800 = 40 * x

rearranging

40 * x - 600 = 0

The above would be the equation of the situation

6 0

2 years ago

Read 2 more answers

4.5x-7=20 i need help whats the answer

Dmitry [639]

Your answer will be 6.

7 0

2 years ago

Read 2 more answers

To make a profit, a clothing store sells jeans at 115% the amount they paid for them. How much did the store pay for the jeans s

Svetllana [295]

Answer:

The store paid 6.67 times the profit made on the jeans

Step-by-step explanation:

Let the amount the clothing store pay for Jean be X

Let the amount the clothing store sells Jean be Y = X ×1.15

The profit (P) made is the difference between amount the clothing store sells Jean and the amount paid for Jean = Y - X = 1.15X - X

Profit (P) = 0.15X

X = P/0.15 = 6.67P

Therefore, the store paid 6.67 times the profit made on the jeans

8 0

2 years ago