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3 years ago

Pleas help ASAP thank you

Mathematics

2 answers:

diamong [38]3 years ago

3 0

Answer:

The answer:7.5

Step-by-step explanation:

Alex17521 [72]3 years ago

3 0

Answer : 7.5

15*2=30

45-30=15

15/2= 7.5!!

(please mark me brainlest)

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When you graph a line using slope-intercept form (y=mx+b), you graph the ___________ first and then use the ___________ to find

Vesna [10]

D you first plot the point then use the slope to find the next point.

8 0

3 years ago

Read 2 more answers

Find the angle between the given vectors to the nearest tenth of a degree. u = <-5, -4>, v = <-4, -3> (1 point)

sesenic [268]

Angle between $u = -5i-4j , v=-4i-3j$ is $x =0$ ° .

Step-by-step explanation:

We have , two vectors u = <-5, -4>, v = <-4, -3> or , $u = -5i-4j , v=-4i-3j$

We need to find angle between these two vectors . Let's find out:

We know that dot product of two vectors is defined as :

$u.v =|u|(|v|)cosx$ , where x is angle between u & v !

⇒ $u.v =|u|(|v|)cosx$

⇒ $cosx =\frac{u.v}{|u|(|v|)}$

Now , $u.v = (-5i-4j)(-4i-3j)$

⇒ $u.v = (-5i-4j)(-4i)-(-5i-4j)(3j)$

⇒ $u.v = 20+12$ { $i(j) = j(i) =0$ }

⇒ $u.v = 32$

Now , Modulus of any vector $r = xi+yj$ is $|r| = \sqrt{x^{2}+y^{2}}$ So ,

$|u| = \sqrt{(-5)^{2}+(-4)^{2}} = \sqrt{25+16} = \sqrt{41} \\\\|v| = \sqrt{(-4)^{2}+(-3)^{2}} = \sqrt{16+9} = \sqrt{25} = 5$

Putting all these values in equation $cosx =\frac{u.v}{|u|(|v|)}$ we get:

⇒ $cosx =\frac{32}{5(\sqrt{41})}$

⇒ $cos^{-1}(cosx) =cos^{-1}(\frac{32}{5(6.4)})$

⇒ $x =cos^{-1}(1)$ { $cos0 = 1$ }

⇒ $x =0$ °

Therefore , Angle between $u = -5i-4j , v=-4i-3j$ is $x =0$ ° .

8 0

3 years ago

A random sample of vacationers were asked whether they were traveling to another country for their upcoming trip. The resulting

weeeeeb [17]

Answer:

The Margin of error = 0.01

Step-by-step explanation:

Explanation:-

step(i):-

Given confidence interval for the proportion of vacationers traveling abroad

(0.14,0.16)

The 95% of confidence interval for Population proportion with margin of error is determined by

( p⁻ - M.E , p⁻ + M.E)

step(ii):-

The margin of error is determined by

$M.E = Z_{\alpha } \sqrt{\frac{p(1-p)}{n} }$

Given Confidence interval is ( 0.14 , 0.16 )

Now

(( p⁻ - M.E , p⁻ + M.E) = (0.14,0.16)

Equating

p⁻ - M.E = 0.14 ...(i)

p⁻ + M.E = 0.16 ...(ii)

Solving (i) and (ii) equations , we get

p⁻ - M.E = 0.14

p⁻ + M.E = 0.16

- - -

- 2 M.E = -0.02

M.E = 0.01

The margin of error = 0.01

Conclusion:-

The margin of error = 0.01

8 0

3 years ago

Please help me!!!

tester [92]

Hello there!

A) What percent of adults drink only coffee?

Percent of only coffee = 55 - (15 - 5) - (25 - 5) - 5
                                = 55 - 10 - 20 - 5
                                = 20%
Thus, 20% of the adults drink coffee

B) What percent of adults drink only soda?

Percentage of only soda = 45 - (25 - 5) - 5
                                    = 45 - 20 - 5
                                    = 25 - 5
                                    = 20%
Thus, 20% of adults drink only soda

C) What percentage of adults drink none of the beverage types?

Percentage of the beverage types = 100 - 20 - 20 - 5 - 10 - 20 - 5
                                                 = 20%
Thus, 20% percentage of adults drink none of the beverage types.

I hope this answer helps!

As always, I'm here to help!

6 0

4 years ago

What is the mean total?

tamaranim1 [39]

Answer: the answer is 8

Step-by-step explanation:

the Mean total just means average

Formula =

sum of all numbers / amount of numbers

= 5+10+15+7+3 = 40

40 / 5 = 8

8 0

3 years ago