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aleksandrvk [35]
3 years ago
8

Find the surface area and round to the nearest hundredths place when necessary.

Mathematics
1 answer:
Step2247 [10]3 years ago
7 0

Answer:

Let's find the area of 1 triangle (this may not be the formula but I'm doing it in a more easier way).

20(base) x 10.5(height) = 210

210 divided by 2 ( x 1/2) = 105

Since there are 4 sides we must multiply the area of 1 triangle four times! Since there are 4 sides of triangles.

105 x 4 = 420

Oh and I almost forgot! We need to find the area of the square below!

20 x 20 = 400!

Now we add both areas of all the triangles and the area of the bottom square:

420 + 400 = 820 in2 is your answer. (we use the unit 2 since we are finding areas and adding them up)

Formula of a triangle:

BH x 1/2

B(base) x H(height) x 1/2 (basically just dividing by 2)

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1. Find the equation of a line passing through the points (1,-2) and (-3,10).​
liraira [26]

Answer:

Step-by-step explanation:

(1 , -2)   x₁ =1 & y₁ = -2

(-3,10)  x₂= -3 & y₂ = 10

First we need to find the slope.

\boxed{Slope = $\dfrac{y_{2}-y_{1}}{x_{2}-x_{1}}$}\boxed{Slope=\dfrac{y_{2}-y_{1}}{x_{2}-x_{1}}}

          =\dfrac{10-[-2]}{-3-1}\\\\\\=\dfrac{10+2}{-4}\\\\\\=\dfrac{12}{-4}\\\\\\= - 3

m = -3

Equation of the line: y = mx + b

y = -3x + b

To find the value of b, take one of the point and substitue in the above equaiton.

(1 , -2)

-2 = -3*1 + b

-2 = -3 + b

-2 + 3 = b

b = 1

Equation of the line:

y = -3x + 1

4 0
3 years ago
-3(5x + 6) + 2 = 2(8 + 8x) - 1
bija089 [108]
So first, we multiply out the brackets.
-15x - 18 + 2 = 17 + 16x -1
Then, bring all the terms onto one side so you can solve.
-15x-18+2-17-16x+1=0
Then, we simplify this.
-31x-32=0
Then, isolate x
-31x=32
x=32/-31 or -1.03 (nearest hundredth )
6 0
3 years ago
Please can u help me solve this??<br><br> I think its A. but im unsure
liberstina [14]
If it is delayed by a month, a possible adjustment to the equation could look something like this:

S = 2(t-1)^2 + 100

These type of transformations are called horizontal shifts, aka "shift along the x-axis".  So the answer is A.
6 0
3 years ago
Determine whether the ordered pair is a solution of the linear equation. thanks in advance!!
eduard

Answer:

no

Step-by-step explanation:

because it is nor a solution

4 0
4 years ago
A hall measures 12 metres long,
Ilya [14]

\huge\sf\red{Answer : - }

<h2>Given :- </h2>

  • Length of the hall = 12m

  • wide of the hall (Breadth) = 10m

  • Height of the hall = 4m

<h2>To Find :- </h2>

  • Surface area of the walls (Four walls area)

<h2>Formula :- </h2>

Four walls area of the hall = 2h(l+b)

where,

  • h = height

  • l = length

  • b = breadth

<h2>Solution : - </h2>

By substituting values according to the formula,

➙ 2 × 4m(12m + 10m)

➙ 8m(22m)

➠ 176m²

It's option B

<h3><u>Hence, The surface area of the walls is (B) 176m²</u></h3>

<h2 /><h2 />
7 0
3 years ago
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