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4 years ago

Find the value of 3u-8 given that -7u + 9=2

Mathematics

2 answers:

bulgar [2K]4 years ago

8 0

Answer:

-5

Step-by-step explanation:

-7u+9=2

-7u=2-9

-7u=-7

7u=7

u=7/7

u=1

3(1)-8=3-8=-5

eduard4 years ago

8 0

Step 1: Solve for u using the equation -7u+9=2

-7u+9=2
-9 -9
_________
-7u=-7
__ __
-7 -7
_________
U=-1

Step 2: Substitute u into 3u-8

3u-8
3(-1) -8
-3 -8
-11

The value of 3u-8 is -11

Hope this helps comment below for more questions :)

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Mrs. Eraca gives this cute dog 4.5 treats that cost $3.59 per treat. How much total money does she spend on this mooching pooch?

kozerog [31]

Answer:

$16.16

Step-by-step explanation:

multiply the amount of treats by the cost of each treat.

4.5 × 3.59 = 16.155.

rounded up gives you $16.16

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3 years ago

Which inequality represents the sentence below? Two more than a number is less than 14. 2 + n less-than-or-equal-to 14 2 + n les

Romashka [77]

Answer: 2 + n less-than 14

Or 2 + n < 14

Step-by-step explanation:

Let n = number

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n + 2 < 14

Or 2 + n < 14 which is the same as

2 + n less-than 14

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3 years ago

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Naddik [55]

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3 years ago

100 POINTS PLUS BRAINLY

Iteru [2.4K]

Answer:

$\sf adjacent = 4.5 \ ft$

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angle of 71°

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2 years ago

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Questions 2-7 will all be in regards to this data set:Observation X Y1 20 302 23 353 28 404 26 385 24 376 32 457 35 508 24 349 3

Tomtit [17]

Answer:

r =0.4437

Step-by-step explanation:

We have the follwoing dataset:

X: 20,23,53,4,24,32,35,24,31,23

Y: 30,35,40,38,37,45,50,34,42,32

n=10

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

And in order to calculate the correlation coefficient we can use this formula:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

For our case we have this:

n=10 $\sum x = 269, \sum y = 383, \sum xy = 10609, \sum x^2 =8645, \sum y^2 =15007$

Th excel figure attached shows the calculations for each sum.

$r=\frac{10(10609)-(269)(383)}{\sqrt{[10(8645) -(269)^2][10(15007) -(383)^2]}}=0.4437$

So then the correlation coefficient would be r =0.4437

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4 years ago