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3 years ago

Please help asap<3(grade 8 question)

Mathematics

1 answer:

Art [367]3 years ago

7 0

Answer:

Step-by-step explanation:

We know that the shape is a triangle, and the first angle is 90 degrees.

since 1 and 2 are equal, and we know that the sum of the angles in a triangle is 180, we have:

180-90 = 90/2 = 45

(are you sure this is an 8th grade question? Because I'm 10 years old....)

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Help please<br> 14 + 18 ÷ 2 x 3 - 7

Komok [63]

Answer:

Step-by-step explanation:

1.) 14 + 18 ÷ 2 × 3 - 7

2.) 18 ÷ 2 = 9

3.) 14 + 9 × 3 - 7

4.) 9 × 3 = 27

5.) 14 + 27 - 7

6.) 14 + 27 = 41

7.) 41 - 7 = 34

5 0

3 years ago

Use vectors to find the interior angles of the triangle with the given vertices. (Enter your answers as a comma-separated list.

SOVA2 [1]

Answer:

23.92°, 78.503°, and 77.577°

Step-by-step explanation:

The coordinates of the vertices of the triangle are;

X(-3, -5), Y(2, 6), Z(6, 3)

The vectors are;

z = $\left \langle 2 - (-3), 6 - (-5) \right \rangle$ = $\left \langle 5, 11 \right \rangle$

y = $\left \langle 6 - (-3), 3 - (-5) \right \rangle$ = $\left \langle 9, 8 \right \rangle$

x = $\left \langle 2 - 6, 6 - 3 \right \rangle$ = $\left \langle -4, 3 \right \rangle$

$cos (\alpha ) = \dfrac{z \cdot y}{\left | z \right | \times \left | y \right |}$

Therefore, we get;

$cos (\alpha ) = \dfrac{5 \times 9 + 11 \times 8 }{\left | \sqrt{5^2 + 11^2} \right | \times \left | \sqrt{9^2 + 8^2} \right |} = \dfrac{133}{\sqrt{146} \times \sqrt{145} } \approx 0.91409$

α = arccos(0.91490) ≈ 23.92°

γ = The angle between -y and x

-y = $\left \langle -9, -8 \right \rangle$

We get;

$cos (\gamma) = \dfrac{-y \cdot x}{\left | -y \right | \times \left | x \right |}$

Therefore;

$cos (\gamma) = \dfrac{-9 \times -4 + -8 \times 3 }{\left | \sqrt{(-9)^2 + (-8)^2} \right | \times \left | \sqrt{(-4)^2 + 3^2} \right |} = \dfrac{12}{\sqrt{145} \times \sqrt{25} } \approx 0.199309$

γ = arccos(0.199309) ≈ 78.503°

γ ≈ 78.503°

By angle sum property, β = 180° - (α + β)

β ≈ 180° - (23.92° + 78.503°) = 77.577°

β ≈ 77.577°

The interior angles are;

23.92°, 78.503°, and 77.577°

4 0

3 years ago

Factor: b2 + 11b + 10<br> pls help i need it

Serhud [2]

(b+1) (b+10) hopefully this is right

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3 years ago

What is the volume of this cylinder? (Round to the nearest inch ) 7( radius)

Agata [3.3K]

Answer:

The formula for the volume of a cylinder is:

V= pi * radius^2 * height

When the values are plugged in, you would have:

V= pi * 7^2 * 14

Then simplified....

V= pi * 49 * 14

V= pi * 686

V= 2155.13256036

and when rounded to the nearest inch...

the volume would be approximately 2155 inches.

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3 years ago

SOMEONE PLS HELP will mark brainliest

kogti [31]

Answer:

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Step-by-step explanation:

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3 years ago