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3 years ago

Please please please please help me please

Mathematics

2 answers:

masha68 [24]3 years ago

8 0

Answer:

the answer is c 123 m

bcoz perimeter of Pentagon is sum of 5 sides therefore 123/5 x. 5 = 123

myrzilka [38]3 years ago

4 0

Answer:

The third option; 123m

Step-by-step explanation:

The perimeter of a pentagon = 5S

5*123/5

Cancel the 5's

123m

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Jose drove to the mountains last weekend. There was heavy traffic on the way there, the trip took eight hours. When jose drove h

vodka [1.7K]

Answer:

The distance is 280 miles

Step-by-step explanation:

Given

When going to the mountain:

Let the speed be x.

$Speed = x$

$Time = 8$

When going home:

$Speed = 21 + x$

$Time = 5$

Required

Determine the distance of the mountains

Distance is calculated as:

$Distance = Speed * Time$

When going to the mountains, the distance is:

$Distance = x * 8$

When going home, the distance is:

$Distance = (21 + x) * 5$

It should be noted that, the distance is the same.

So, we have:

$x * 8 = (21 + x) * 5$

Open bracket

$x * 8 = 21* 5 + x * 5$

$8x = 105 + 5x$

Collect Like Terms

$8x - 5x= 105$

$3x= 105$

Divide both sides by 3

$x= \frac{105}{3}$

$x= 35$

Substitute 35 for x in

$Distance = x * 8$

$Distance = 35 * 8$

$Distance = 280$

<em>The distance is 280 miles</em>

5 0

3 years ago

I need help factoring this expression

omeli [17]

X^2(x+2)-4(x+2)

(x^2-4) (x+2) = 0

do you have to keep going/?

or thats all they want?

3 0

3 years ago

1/4a-3=1/4a(a-?) I need to finish this quick can someone repy fast!

lina2011 [118]

Answer:

Step-by-step explanation:

Factoring out a 1/4 from 1/4a - 3, you get 1/4 (a - 12) as 12 * 1/4 = 3. Thus, ? = 12.

6 0

2 years ago

Mariela earned the following test scores in math: 95, 90, 100, 85, 80 Mr. Adams accidentally entered Mariela’s next test score a

Vesnalui [34]

Answer:

Before the error, the mean and the median were both 90.

The error added an outlier to the data set.

After the error, the mean was 75 and the median was 87.5

The mean was impacted by the error more than the median

Step-by-step explanation:

First is to put the data in order from smallest to largest

80,85,90,95,100

The mean is add up the data and divide by the number of points. The median is the middle of the data

Mean = (80+85+90+95+100)/5=450/5 = 90

Median = 90

When a 0 is added

0, 80,85,90,95,100

There is now an outlier, which is a data point far away from the others

Mean = (0+80+85+90+95+100)/6=450/6 = 75

Median = (85+90)/2 = 87.5

When the data set is even, take the two middle numbers and average them

The mean was impacted more than the median. It went from 90 to 75, where the median went from 90 to 87.5

5 0

3 years ago

Read 2 more answers

A particle travels along the x-axis with velocity v(t)=(2t)/(1+t^2) m/s for 0≤t≤3 seconds. If the particle’s position at t = 0 i

Mrac [35]

Answer:

7.3025850929

Step-by-step explanation:

v(t)=(2t)/(1+t^2)

To find the position we need to integrate the function

p(t) = ∫ v(t)

p(t) =∫(2t)/(1+t^2) dt

Using u substitution

u = 1+t^2

du =2t dt

p(t) =∫(du)/(u)

We know that the integral of 1/u du is ln |u|

p(t) = ln|u| +C

Substituting back for u

p(t) = ln|1 +t^2| +C

To find the value of C, we let t=0

p(0) = ln|1 +0| +C = 5

= ln(1) +C =5

0 +C =5 Therefore C=5

p(t) = ln|1 +t^2| +5

We want to find the position at t=3

p(3) = ln|1 +3^2| +5

= ln(10) +5

=7.3025850929

6 0

3 years ago

Read 2 more answers