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4 years ago

Plz help me with this question!! Giving 10 points!

Mathematics

1 answer:

BartSMP [9]4 years ago

8 0

Add the number and that should be your numbers

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What is equivalent to -1/4y -2 1/4y + 1/2 (4-2y)

yan [13]

Answer:

$14y - 8 = 0$

Step-by-step explanation:

$- \frac{1}{4} y - 2 \frac{1}{4} y + \frac{1}{2} (4 - 2y) = 0 \\$

$- \frac{1}{4} y - \frac{9}{4} y + 2 - y = 0$

$( - \frac{1}{4} y - \frac{9}{4} y + 2 - y = 0)4$

$- y - 9y + 8 - 4y = 0$

$- y - 9y - 4y + 8 = 0$

$- 14y + 8 = 0$

$14y - 8 = 0$

7 0

3 years ago

Consider the following: A medical researcher wants to determine the effects of pH (a measure of alkalinity or acidity, with pure

natita [175]

Answer:

See below

Step-by-step explanation:

<h3>Continuation of the question</h3>

Data in the table:

PH 4 5 6 7 8 9 10 11

Bacteria 116 120 131 136 141 151 148 163

Create a scatter plot to represent the data: Based on the data and your scatter plot, what do you think a good linear function would be to represent the data?

<h3>Solution</h3>

See attached for scatter plot

We can see the chart is close to linear function. Let's build one based on data in the table

The line will be in the form of:

y = mx + b

If we use two points and get the equation

(4, 116) and (8, 141)

Finding the slope:

m = (141-116)/(8-4) = 25/4 = 6.25

Then, finding y-intercept:

116 = 6.25*4 + b
b = 116 - 25 = 91

So the line is:

y = 6.25x + 91

Note: This is approximate best fit graph and it is attached as well. Exact formula for the line is built by using different method and is very close to the one above

4 0

4 years ago

A construction crew is lengthening a road. The crew is adding 6 miles to the road each week. The road originally measured 52 mil

PSYCHO15rus [73]

6x + 52 > 130

Subtract 52 from both sides:

6x > 78

Divide both sides by 6:

X > 78/6

X > 13

7 0

3 years ago

Please help with this!

Zepler [3.9K]

Answer:

1) 7:9

2) 343:729

3) 16:9

4) 64:27

5) 9:11

6) 81:121

7 0

3 years ago

The lifetimes of computer hard drives produced by hishobi company are normally distributed with a mean of 75 months and a standa

Mashutka [201]

The lifetime is months is 85.24 months

Step-by-step explanation:

In this question you are supposed to find the months "X' that is exceeded by 10% of the hard drives.

Exceeded by 10% means a value X on the frequency distribution table that is to the right of the mean score of 75 months showing 10% more.This means exceeding 10% will be months above 0.9 (from 100-90=90%=1-0.9=0.1 as a decimal)

In the standard normal distribution table, look for 0.9, closest value is 0.8997 which gives z=1.2 for y-axis and for x-axis 0.08 to give 1.28

So you have z=1.28, mean μ=75 and δ=8, finding X will gives

You apply the formula;

P(z>X-75/8)

P(z>1.28)=0.1

z=X-μ /δ

1.28=(X-75)/8

8*1.28=X-75

10.24=X-75

10.24+75=X

X=85.24 months

Learn More

Percentile in Normal distribution :brainly.com/question/13700221

Keywords: normally distributed, mean, standard deviation, exceeds

#LearnwithBrainly

7 0

3 years ago