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3 years ago

Identify the value of K ( constant proportionality) for the tables

Mathematics

2 answers:

loris [4]3 years ago

5 0

Tryeeeeeeeeeee. Ok ok I’m sorry

Lerok [7]3 years ago

4 0

Answer:

first table: 3/7

second: 1/2

third: 2

Step-by-step explanation:

use formula y/x

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Which expression is a factor of the expression 20c3+540y3

True [87]

factor 20 out of 20cx*3 =540y*3

so you get 20(cx*3=540y*3) if that is what you are looking for

5 0

2 years ago

you earn $70 per week mowing lawns one week you work 10 hours during the week and spend $20 on gasoline for your mower how much

Basile [38]

Total income is $70/week. $20 of that goes towards the cost of gas. Thus, the net earnings were $50 for the week.

$50
------------------- = $5 per hour
10 hours

3 0

3 years ago

Expanded form of 3(4x+5y)

PIT_PIT [208]

= 12x + 15y because 3 x 4x = 12x and 3 x 5y = 15y

3 0

2 years ago

The Student Monitor surveys 1200 undergraduates from 100 colleges semiannually to understand trends among college students. Rece

nlexa [21]

Answer:

A sample size of 385 is needed.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

You feel that a reasonable estimate of the standard deviation is 10.0 hours.

This means that $\sigma = 10$

What sample size is needed so that the expected margin of error of your estimate is not larger than one hour for 95% confidence?

A sample size of n is needed. n is found when M = 1. So

$M = z\frac{\sigma}{\sqrt{n}}$

$1 = 1.96\frac{10}{\sqrt{n}}$

$\sqrt{n} = 1.96*10$

$(\sqrt{n})^2 = (1.96*10)^2$

$n = 384.16$

Rounding up:

A sample size of 385 is needed.

7 0

3 years ago

15% 0f ______ is 12?

Daniel [21]

You can say : 15/100 = 12/? ⇒ ?=12*100/15 ⇒ ? = 80 so 15% of 80 is 12 :)))
i hope this is helpful
have a nice day

5 0

2 years ago