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3 years ago

What is the sum of -7x -4 and -4x + 13

Mathematics

1 answer:

irina [24]3 years ago

3 0

The sum of it :-7x+4x-4+13. -3x=9 divided both sides by 3,,,,the answer is -3

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Helpp its for a test and I don’t know how to do it

lozanna [386]

X f(x)
1 -12
0 -9
-1 -6

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2 years ago

HOW CAN YOU WRITE 10/3 AS A DIVISION EXPRESSION AND AS A MIXED NUMBER?

Anni [7]

Answer: 10.3 would be a mixed number

Step-by-step explanation:

Divide 12 into 46. You get 3 with a remainder of 10. 3 is the whole number of the mixed number, 10 is the numerator of the fraction, and 12 is the denominator. The fraction can be reduced to 5/6.

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3 years ago

Compare the slopes of parallel lines and perpendicular lines?

Gnesinka [82]

Answer: C

Step-by-step explanation: l-7&!:

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3 years ago

The authors of a paper presented a correlation analysis to investigate the relationship between maximal lactate level x and musc

ArbitrLikvidat [17]

Answer:

a) Sample correlation coefficient, r = 0.7411

bi) test statistic, t = 4.102

bii) P-value = 0.000736

Step-by-step explanation:

a) The formula for the sample correlation coefficient is given by the formula:

$r = \frac{S_{xy} }{\sqrt{S_{xx} S_{yy} }} }$

$S_{xx} = 2,648,130.357\\S_{yy} = 36.7376,\\S_{xy} = 7408.225$

$r = \frac{7408.225}{\sqrt{2648130.357*36.7376} }$

r = 0.7511

i) formula for the test statistic is given by the formula:

$t = \frac{r\sqrt{n-1} }{\sqrt{1 - r^{2} } }$

sample size, n = 4

$t = \frac{0.7511\sqrt{14-1} }{\sqrt{1 - 0.7511^{2} } }$

t = 4.102

ii) Degree of freedom, df = n -2

df = 14 -2

df = 12

The P-value is calculate from the degree of freedom and the test statistic using excel

P-value =(=TDIST(t,df,tail))

P-value = (=TDIST(4.1,12,1)

P-value = 0.000736

4 0

2 years ago

25m/s to miles/h <br>Can anyone solve it?<br>With explanation if you can

Dimas [21]

25 meters per second x 60 seconds = 1500 meters per minute

1500 meters per minute x 60 minutes per hour = 90,000 meters per hour

1 mile = 1609.34 meters

90000/1609.34 = 55.92 miles per hour

round answer to either 55.9 or 56 mph depending on what you need.

6 0

3 years ago