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3 years ago

Please help------------,

Mathematics

1 answer:

Lapatulllka [165]3 years ago

7 0

Answer:

600 cm²

Step-by-step explanation:

The shaded area (A) is calculated as

A = area of square - ( area of 3 unshaded triangles )

area of square = 40 × 40 = 1600 cm²

area of lower right triangle = $\frac{1}{2}$ × 20 × 40 = 10 × 40 = 400 cm²

area of upper left triangle = $\frac{1}{2}$ × 40 × 20 = 20 × 20 = 400 cm²

area of lower left triangle = $\frac{1}{2}$ × 20 × 20 = 10 × 20 = 200 cm²

Then

A = 1600 - (400 + 400 + 200 ) = 1600 - 1000 = 600 cm²

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What is 1/2 + 1/2 + 9 - 11

Step2247 [10]

The answer to this question would be -1.
1/2 + 1/2 + 9 - 11
1/2 + 1/2 = 1
1 + 9 = 10
10 - 11 = -1
Therefore, this will equate to -1.

3 0

4 years ago

Read 2 more answers

Can somebody help me with this?

Natasha_Volkova [10]

Step-by-step explanation:

Hey there!

By looking through figure, l and m are parallel lines and a transversal line passes through the lines.

Now,

7x + 12° = 12x - 28°( alternate angles are equal)

12°+28° = 12x - 7x

40° = 5x

$x = \frac{40}{5}$

Therefore, x = 8°

Now,

12x - 28° + 9y - 77 = 180° ( being linear pair)

12×8° - 28° + 9y -77° = 180°

96° - 28° + 9y - 77° = 180°

-9 + 9y = 180°

9y = 180° + 9°

y = 189°/9

Therefore, y = 21°

Therefore, X = 8° and y= 21° .

Hope it helps....

4 0

4 years ago

Find the length of the radius C

Svetach [21]

I hope this helps you

|HJ|=20/3 pi

|HJ|=4/9pi÷360.pi.r^2

20/3=4/9÷360.pi.r^2

20.270÷pi=r^2

5400÷3=r^2

1800=r^2

r=30 square root of 2

5 0

4 years ago

Last year, 45% of business owners gave a holiday gift to their employees. A survey of business owners conducted this year indica

natka813 [3]

Answer:

a)x₁ = 24 business owners plan to provide a gift this year

b) p-value = 0,0017

c)p-value < α we have to eject H₀ And support the claim that the proportion of business owners providing gifts has decrease

Step-by-step explanation:

a) Sample size 80

proportion p₁ = 30 % p₁ = 0,3

Then x₁ = 80*0,3

x₁ = 24 business owners plan to provide a gift this year

b) Hypothesis Test

Null Hypothesis H₀ p₁ = 0,45

Alternative Hypothesis Hₐ p₁ < 0,45

p₁ = 0,3 then q₁ = 1 - 0,3 q₁ = 0,7

z(s) = ( p₁ - 0,45 )/ √p₁* q₁ / n

z(s) = - 0,15 / √0,002625

z(s) = - 0,15 / 0,05123

z(s) = - 2,9279

b)From z-table we find p-value = 0,0017

c) If α = 0,05 ( significance level ) as

p-value < α we have to eject H₀ And support the claim that the proportion of business owners providing gifts has decrease

6 0

3 years ago

X^2 + 5x = quadratic equation =

timama [110]

Hi there!

The question gives us the quadratic equation , and it tells us to solve it using the quadratic formula, which goes as . However, we must first find the values of a, b, and c. The official quadratic equation goes as , which matches the format of the given quadratic equation. Hence, the value of a would be 1, the value of b would be 5, and the value of c would be 3. Now, just plug it back into the quadratic equation and simplify to get the zeros of the equation.

x = \frac{-b \pm \sqrt{b^2 - 4ac} }{2a}

x = \frac{-(5) \pm \sqrt{(5)^2 - 4(1)(3)} }{2(1)}

x = \frac{-5 \pm \sqrt{25 - 12} }{2}

x = \frac{-5 \pm \sqrt{13} }{2}

x = \frac{-5 \pm 3.61 }{2}

x = \frac{-5 + 3.61 }{2}, x = \frac{-5 - 3.61 }{2}

x=-0.695 \ \textgreater \ \ \textgreater \ -0.7, x= -4.305 \ \textgreater \ \ \textgreater \ x=-4.31

Therefore, the solutions to the quadratic equation are x = -0.7 and x = -4.31. Hope this helped and have a phenomenal day!

Your answer is 4.31

4 0

3 years ago

Please help------------,​

Please help------------,