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mart [117]
3 years ago
12

Which expressions are equivalent to z+(z+6)

Mathematics
2 answers:
mr_godi [17]3 years ago
8 0
Ddddddddddddddddddddddddddd
Nezavi [6.7K]3 years ago
4 0

Answer:

Step-by-step explanation:

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1) Which linear equation BEST represents the line of best fit for the scatterplot? A) y = x B) y = 3x C) y = -3x D) y = 5x + 1 2
Tresset [83]

Answer:

1) A. y = x + 2

Once a line of best fit has been placed upon a scatter graph it is straightforward to find the equation. The general equation of a straight line is: y = mx + c Where m is the slope (gradient) of the line and c is the y-intercept.

4) d. strong positive correlation.

The slope of the line is positive. Most points lie close to the line.  

(I am not sure if this is correct or not, I am so sorry)

3 0
3 years ago
Which pair of transformations moves quadrilateral 1 to quadrilateral 2?
malfutka [58]

Translate it 8units to the right then reflect it over the line y=-3

Why?

  • We can see the Quadrilateral is in Quadrant 3.
  • If we translate it by 8units right it come to Quadrant 4.
  • Now reflect it over line y=-3
  • we will get Quadrilateral 2
6 0
3 years ago
Read 2 more answers
A boat can travel 40mph in still water. If it travels 126 miles with the current in the same length of time it travels 114 miles
Elena-2011 [213]

Answer:

rate of the current = 2 mph

Step-by-step explanation:

d = rt

Let c = rate of the current

Rate going downstream = c + 40

Time going downstream = 126/(40 + c)

Rate going up stream =  40 - c

Time going upstream = 114/(40 - c)

Since the times are equal, then

126/(40 + c) = 114/(40 - c)

126(40 - c) = 114(40 + c)

5040 - 126c = 4560 + 114c

   240c  =  480

          c = 2 mph

8 0
2 years ago
A civil engineer is analyzing the compressive strength of concrete. Compressive strength is normally distributed with σ = 31.62
AysviL [449]

Answer:

A sample size of at least 737 specimens is required.

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{1-0.99}{2} = 0.005

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

So it is z with a pvalue of 1-0.005 = 0.995, so z = 2.575

Now, find the width 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.

In this problem, we have that:

M = 3, \sigma = 31.62

So:

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

3 = 2.575*\frac{31.62}{\sqrt{n}}

3\sqrt{n} = 81.4215

\sqrt{n} = 27.1405

n = 736.60

A sample size of at least 737 specimens is required.

6 0
3 years ago
Can someone please help me​
seropon [69]

Answer:

131.88cm

Step-by-step explanation:

Implement the formula for circumference of a circle:

2×pi(3.14)×r, r= 21cm and pi is given as 3.14. Substitute your given values into the formula above:

2 × 3.14 × 21= 131.88cm to the nearest hundreth

7 0
3 years ago
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