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3 years ago

How many sides do 2 octagons, 4 pentagons, and 5 triangles have in all?

Mathematics

1 answer:

Setler [38]3 years ago

3 0

Answer: 51

Step-by-step explanation:

2 octagons have 16 sides because an octagon has eight sides. So, 8x2=16.

4 pentagons have 20 sides because a pentagon has 5 sides. So, 4x5=20.

5 triangles have 15 sides because a triangle has 3 sides. So, 5x3=15.

In all, 16+20+15= 51

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Save $5 of every $7 made, if you made $128 how much can you spend, how do I do this problem?

dangina [55]

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128/2 = $64

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3 years ago

Prism A and prism B are similar with a ratio of similarity of 2:3. If the volume of prism A is 36 cubic units, what is the volum

kozerog [31]

Ratio of their
x = 27*36 / 8 volumes = 2^3 : 3^3 or 8:27

so 8/27 = 36/x

x = 27*36 / 8 = 121.8 cubic units

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4 years ago

A two digit number has 6 more ones than tens. Twice the sum of the number and its reverse is 6 more than ten times the number. F

Alona [7]

The number with the given characteristics is 17

<h3>How to determine the numbers?</h3>

Let the tens be x and the units be y.

So, the number is 10x + y

The relationship between the digits is

y = x + 6

The relationship between the number and the reverse is

2(10x + y + 10y + x) = 6 + 10 * (10x + y)

Simplify the second equation

2(11x + 11y) = 6 + 100x + 10y

Open the brackets

22x + 22y = 6 + 100x + 10y

Substitute y = x + 6

22x + 22(x + 6) = 6 + 100x + 10(x + 6)

Expand

22x + 22x + 132 = 6 + 100x + 10x + 60

Collect like terms

22x + 22x - 100x - 10x = 6 + 60 - 132

Evaluate the like terms

-66x = -66

Divide by -66

x = 1

Substitute x = 1 in y = x + 6

y = 1 + 6

y = 7

Recall that the number is 10x + y

So, we have

Number = 10 * 1 + 7

Evaluate

Number = 17

Hence, the number is 17

Read more about numbers and digits at:

brainly.com/question/12992284

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7 0

2 years ago

Can you help me thanks

Nata [24]

Answer:

it's D

-3b > -24+15

-3b >-9

b>3

3 0

3 years ago

If the Pacific plate moves around 5cm a year how long will it take Los Angeles to move one kilometer?

mr_godi [17]

We need to work with the same units, so first, we convert 1 km to cm.

1 km = 1000 m
1 m = 100 cm
1 km = 100,000 cm

Now we divide 100,000 cm by 5 cm.

$\dfrac{100,000~cm}{5~cm} = 20,000$

Answer: It will take 20,000 years.

7 0

3 years ago