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vaieri [72.5K]
3 years ago
12

What is an equivalent expression for 0.3(12y) ?

Mathematics
1 answer:
IgorLugansk [536]3 years ago
3 0
0.3(12y)
= 3.6y

hope this helps :)
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Find the number of distinct triangles with c=3, b=5 and B=85 degrees
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The area of a rectangle is 70 m², and the length of the rectangle is 11 m less than three times the width. Find the dimensions o
11111nata11111 [884]

Step-by-step explanation:

the area of a rectangle is

length × width

in our case

length × width = 70 m²

length = 3×width - 11

we can use this second equation in the first and get

(3×width - 11) × width = 70

3×width² - 11×width - 70 = 0

the general solution to a quadratic equation is

x = (-b ± sqrt(b² - 4ac))/(2a)

in our case

a = 3

b = -11

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x = (11 ± sqrt((-11)² - 4×3×-70))/(2×3) =

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= (11 ± sqrt(961))/6

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the negative solution is not applicable for a length in an object.

so, only x1 = 7 m is our solution.

the width of the rectangle is 7 m.

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7 0
2 years ago
*you get 16 points*PLEASE ANSWER i’m kinda failing so help
sleet_krkn [62]

Answer:

Graph 4

Step-by-step explanation:

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3 0
3 years ago
What is the perimeter of the octagon
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marysya [2.9K]

Let's find the perimeter first by adding all the side lengths together. There are two missing side lengths, which we can find by taking the side opposite them and subtract the side behind the missing side from them.

I've attached a diagram showing how to find the side lengths.

Now let's add all the side lengths together: 4 cm + 8 cm + 8 cm + 2 cm + 4 cm + 6 cm = 32 cm

The perimeter of this figure is 32 cm.

---

To find the area we can divide this figure into 2 rectangles. On the second attached diagram, I've split the figure into two and labeled the length and width of each rectangle.

Area of a rectangle = length * width

Area of red labeled rectangle = 4 cm * 2 cm = 8 cm²

Area of yellow labeled rectangle = 8 cm * 4 cm = 32 cm²

Add the two areas together: 8 + 32 = 40

The area of the figure is 40 cm².

6 0
3 years ago
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