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3 years ago

Help pls i need this now

Mathematics

1 answer:

Yanka [14]3 years ago

7 0

Answer:

3.14

Step-by-step explanation:

Formula: $b= \sqrt{c^2-a^2}$

b= $\sqrt{2.1^2-1.4^2}$

b = $\sqrt{2.45}$

b = 1.57

To get x you need to double b which is

3.14

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A girl's feet are negative 4/5 yards from the surface of a pool. A boy's feet are negative 2/5 yards from the surface of the poo

sineoko [7]

Answer:

The boy's feet are closer to the surface of the pool because negative 4 over 5 < negative 2 over 5.

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3 years ago

Helpppppp Asap!!!!!! The question is in the picture

Dominik [7]

The approximate length of side AB is 14.0. The correct option is B. 14.0 units

<h3>Law of sines </h3>

From the question, we are to determine the measure of side AB

First, we will determine the measure of angle A

A + B + C = 180° (<em>Sum of angles in a triangle</em>)

A + 65° + 35° = 180°

A = 180° - 65° - 35°

A = 80°

Now, using the law of sines

c/sinC = a/sinA

c = AB

a = BC = 24

Thus,

c/sin35° = 24/sin80°

c = (24×sin35°)/sin80°

c = 13.978

c ≈ 14.0

∴ AB = 14.0

Hence, the approximate length of side AB is 14.0. The correct option is B. 14.0 units

Learn more on Law of sines here: brainly.com/question/24138896

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4 0

2 years ago

What is the answer to -0.3x 2=0.4x-0.1

ch4aika [34]

That blank is a plus sign

ok so rememmber you can do anythiing to an equation as long as you do it to both sides

-0.3x+2=0.4x-0.1
add 0.3x to both sides
2=0.7x-0.1
add 0.1 to both sides
2.1=0.7x
times 7 both sides
21=7x
divide both sides by 7
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3 years ago

Write a system of linear equations for the graph below

Oliga [24]

1q+2x-1 liner #1 liner # is 18% one

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4 years ago

constructing a border around a pool a circular pool measures 10 feet across. one cubic yard of concrete is to be used to create

Paha777 [63]

Answer:

We get w = 1.508 feet.

Step-by-step explanation:

Let w be the width of the border.

The diameter of the pool will be 10 feet.

The depth will be 3 inches. So, we will convert it to feet.

3 inches = $\frac{3}{12}=0.25 feet$

The circular area including pool and the border, radius = $(w+5)$

Border area = Total area - pool area

= $\pi (w+5)^{2} -\pi (5)^{2}$

Putting pi = 3.14 and solving the expression we get the following equation:

$3.14w^{2}+31.4w-53.5$

As given one cubic yard of concrete is to be used, this is the volume to be used.

1 cubic yard = 27 cubic feet

Now using the volume given and thickness of this area that is 0.25 feet.

$0.25(3.14w^{2}+31.4w-53.5) =27$

$=> 0.785w^{2}+7.85w-13.375-27= 0$

$=> 0.785w^{2}+ 7.85w-13.625= 0$

Solving this quadratic equation, we get w = 1.508 feet and w = -11.508 feet.

Neglecting the negative value, we get w = 1.508 feet.

3 0

3 years ago