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Rudik [331]
3 years ago
13

What is the value of the expression below when x = 4 2x² + x – 5

Mathematics
1 answer:
AnnZ [28]3 years ago
8 0
2(4)^2 +4- 5
2(16) +4 - 5
32-1
=31
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To test the purity of the hydrazine, the chemist collected a sample 1/2000th the volume of the batch produced. If the sample siz
Bad White [126]

If 0.4 liters is 1/2000 of the production batch, then the production batch is 2000 * 0.4 liters

2000 * 0.4 liters = 800 liters

3 0
3 years ago
A piece of paper is 0.00075 inches thick. How many sheets of paper will be in a stack that is 2.25 inches high
mario62 [17]
2.25/0/00075 = 3000
There will be 3000 sheets of paper
the total height of the stack is 2.25
7 0
3 years ago
The correlation coefficient r between the values assumed by two variables, X
Flura [38]

The slope of the line of best fit to the raw-score scatter plot is 0.98

  • The equation is y = 0.98x - 3.74
  • The value of y given that x = 12 is 8.02

<h3>How to determine the slope of the line?</h3>

From the question, we have the following parameters that can be used in our computation:

  • Standard deviations of X, Sx = 1.88
  • Standard deviations of Y, Sy =2.45
  • Correlation coefficient, r between X and Y = 0.75

The slope (b) of the line is calculated as

b = r * Sy/Sx

Substitute the known values in the above equation, so, we have the following representation

b = 0.75 * 2.45/1.88

Evaluate

b = 0.98

<h3>The equation of the line of best fit</h3>

A linear equation is represented as

y = bx + c

Where

Slope = b

y-intercept = c

In (a), we have

b = 0.98

So, we have

y = 0.98x + c

Recall that the point (13, 9) is on the line of best fit.

So, we have

9 = 0.98 * 13 + c

This gives

9 = 12.74 + c

Evaluate

c = -3.74

So, we have

y = 0.98x - 3.74

<h3>The value of y from x</h3>

Here, we have

x = 12

So, we have

y = 0.98 x 12 - 3.74

Evaluate

y = 8.02

Read more about line of best fit at

brainly.com/question/1564293

#SPJ1

4 0
1 year ago
How many 1 inch cubes do you need to fill a cube with an edge length of 7/12 foot
grigory [225]

Answer:

[you need 343 1 inch cubes]

Step-by-step explanation:

A foot has 12 inches. So if the edge length is 7/12 of a foot, that means that the edge length is 7 inches.

——————

[volume of a cube if the edge length is L, is L x L x L or L cubed]

A one inch cube has an edge length of 1. That means the volume of this cube is 1 x 1 x 1 = 1 inch cubed

——————

This big cube, has an edge length of 7 inches. So the volume is 7 x 7 x 7 = 343 inches cubed.

To find how many 1 inch cubes do you need to fill a 7 inch cube, you divide 343 by 1:

343/1=343 so you need 343 1 inch cubes.

6 0
3 years ago
a shoreline is changing -3 centimeters each year due to erosion. what is the change in shoreline over 6 years?
NikAS [45]

Answer:

-18

Step-by-step explanation:

3 0
3 years ago
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