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Greeley [361]
3 years ago
5

Can someone help me and show how to write the perimeter equation to this polygon.

Mathematics
2 answers:
faltersainse [42]3 years ago
4 0

10x + 8 = 21

x = 1.3

Step-by-step explanation:

a)

In pentagon ABCDE,

AB = DE = 2x + 3 and BC = CD = x + 1

Perimeter of pentagon ABCDE = 21

4x + 2(2x + 3) + 2(x + 1) = 21

4x + 4x + 6 + 2x + 2 = 21

\purple {\boxed {\bold{10x + 8 = 21}}}

b)

10x = 21 - 8

10x = 13

x =  \frac{13}{10}  \\ x = 1.3 \: cm

Lana71 [14]3 years ago
4 0

STEP BY STEP EXPLANATION BOIZ:

A) AB + BC × 2 + AE = 21

B)  The value of x is 1.3

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Cual es el resultado de la operacion algebraica: 25x+12x+31x-8x+5x
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Answer:

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Step-by-step explanation:

Observe que estos son terminos similares... por lo que podemos simplemente sumarlos y restarlos. Entonces obtenemos:

25x + 12x + 31x - 8x + 5x

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anastassius [24]

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Gre4nikov [31]

Problem 3

<h3>Answer:  1/5 of a gallon per minute</h3>

-------------------------

Explanation:

Two points from the graph are (10,2) and (20,4)

Apply the slope formula

m = (y2-y1)/(x2-x1)

m = (4-2)/(20-10)

m = 2/10

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The slope of the graph is 1/5.

Do the same for two points from the table. I'll use the first two rows

m = (y2-y1)/(x2-x1)

m = (4-2)/(10-5)

m = 2/5

The slope of the table is 2/5.

Subtract the two slopes to wrap things up:

2/5 - 1/5 = (2-1)/5 = 1/5

=====================================================

Problem 5

<h3>Answer:  23 degrees</h3>

------------------------

Explanation:

Angles 1 and 3 are same side exterior angles, so they are supplementary due to the parallel lines set up here.

(angle1)+(angle3) = 180

(157) + (angle3) = 180

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angle3 = 23 degrees

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