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Nat2105 [25]
3 years ago
7

What is the area of this figure? Enter your answer in the box. ___ in²

Mathematics
2 answers:
Katena32 [7]3 years ago
5 0
16 * 20 + .5 * 20 * 8 = 320 + 80 = 400
UNO [17]3 years ago
3 0
ANSWER

400 \: {in}^{2}

EXPLANATION

The figure is made up of a parallelogram and a right angle triangle.



The area of the parallelogram is

= base \times height


The base of the parallelogram is 20 inches.




The height of the parallelogram is 16 inches.


The area of the parallelogram is

= 20 \times 16 \: i {n}^{2}


=320 \: i {n}^{2}





The area of the triangle is

=  \frac{1}{2}  \times base \times height

The base of the parallelogram is also 20 inches because opposite sides of a parallelogram are equal in length.




This implies that the area of the triangle is

=  \frac{1}{2}  \times 20 \times 8  \: {in}^{2}



=  10 \times 8  \: {in}^{2}



= 80 {in}^{2}



We add the two areas to get the area of the figure.


=  320 + 80  \: {in}^{2}



=  400 \: {in}^{2}





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What is the smallest positive integer $n$ for which $9n-2$ and $7n + 3$ share a common factor greater than $1$?
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Answer:

  23

Step-by-step explanation:

You can use Euler's method to find the GCF of these values:

  (9n -2) mod (7n +3) = 2n -5

  (7n +3) mod (2n -5) = n +18

  (2n -5) mod (n +18) = n -23

We want this to be zero, so n = 23. (Note that none of the other remainders are zero for any positive integer n.)

The smallest positive integer n for which (9n-2) and (7n+3) share a common factor is 23. (Their common factor is 41.)

_____

<em>Check</em>

  9(23) -2 = 205 = 5×41

  7(23) +3 = 164 = 4×41

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A 14-ounce energy drink contains 10.5 ounces of sugar. How much sugar is in one ounce of the drink?
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Answer:

0.75 ounces per ounce of drink

Step-by-step explanation:

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3 years ago
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3 years ago
Use (a) the midpoint rule and (b) simpson's rule to approximate the below integral. ∫ x^2sin(x) dx with n = 8.
MaRussiya [10]

Answer:

midpoint rule =  5.93295663

simpson's rule = 5.869246855

Step-by-step explanation:

a) midpoint rule

\int\limits^b_a {(x)} \, dx≈ Δ x (f(x₀+x₁)/2 + f(x₁+x₂)/2 + f(x₂+x₃)/2 +...+ f(x_{n}_₂+x_{n}_₁)/2 +f(x_{n}_₁+x_{n})/2)

Δx = (b − a) / n

We have that a = 0, b = π, n = 8

Therefore

Δx = (π − 0) / 8 = π/8

Divide the interval [0,π] into n=8 sub-intervals of length Δx = π/8 with the following endpoints:

a=0, π/8, π/4, 3π/8, π/2, 5π/8, 3π/4, 7π/8, π = b

Now, we just evaluate the function at these endpoints:

f(\frac{x_{0}+x_{1}  }{2} ) = f(\frac{0+\frac{\pi}{8}   }{2} ) = f(\frac{\pi }{16})=\frac{\pi^{2}sin(\frac{\pi }{16})  }{256} = 0.00752134

f(\frac{x_{1}+x_{2}  }{2} ) = f(\frac{\frac{\pi }{8} +\frac{\pi}{4}   }{2} ) = f(\frac{3\pi }{16})=\frac{9\pi ^{2} sin(\frac{3\pi }{16}) }{256} = 0.19277080

f(\frac{x_{2}+x_{3}  }{2} ) = f(\frac{\frac{\pi }{4} +\frac{3\pi}{8}   }{2} ) = f(\frac{5\pi }{16})=\frac{25\pi ^{2} sin(\frac{5\pi }{16}) }{256} = 0.80139415

f(\frac{x_{3}+x_{4}  }{2} ) = f(\frac{\frac{3\pi }{8} +\frac{\pi}{2}   }{2} ) = f(\frac{7\pi }{16})=\frac{49\pi ^{2} sin(\frac{7\pi }{16}) }{256} = 1.85280536

f(\frac{x_{4}+x_{5}  }{2} ) = f(\frac{\frac{\pi }{2} +\frac{5\pi}{8}   }{2} ) = f(\frac{9\pi }{16})=\frac{81\pi ^{2} sin(\frac{7\pi }{16}) }{256} = 3.062800704

f(\frac{x_{5}+x_{6}  }{2} ) = f(\frac{\frac{5\pi }{8} +\frac{3\pi}{4}   }{2} ) = f(\frac{11\pi }{16})=\frac{121\pi ^{2} sin(\frac{5\pi }{16}) }{256} = 3.878747709

f(\frac{x_{6}+x_{7}  }{2} ) = f(\frac{\frac{3\pi }{4} +\frac{7\pi}{8}   }{2} ) = f(\frac{13\pi }{16})=\frac{169\pi ^{2} sin(\frac{3\pi }{16}) }{256} = 3.61980731

f(\frac{x_{7}+x_{8}  }{2} ) = f(\frac{\frac{7\pi }{8} +\pi    }{2} ) = f(\frac{15\pi }{16})=\frac{225\pi ^{2} sin(\frac{\pi }{16}) }{256} = 1.69230261

Finally, just sum up the above values and multiply by Δx = π/8:

π/8 (0.00752134 +0.19277080+ 0.80139415 + 1.85280536 + 3.062800704 + 3.878747709 + 3.61980731 + 1.69230261) = 5.93295663

b) simpson's rule

\int\limits^b_a {(x)} \, dx  ≈ (Δx)/3 (f(x₀) + 4f(x₁) + 2f(x₂) + 4f(x₃) + 2f(x₄) + ... + 2f(x_{n-2}) + 4f(x_{n-1}) + f(x_{n}))

where Δx = (b−a) / n

We have that a = 0, b = π, n = 8

Therefore

Δx = (π−0) / 8 = π/8

Divide the interval [0,π] into n = 8 sub-intervals of length Δx = π/8, with the following endpoints:

a = 0, π/8, π/4, 3π/8, π/2, 5π/8, 3π/4, 7π/8 ,π = b

Now, we just evaluate the function at these endpoints:  

f(x₀) = f(a) = f(0) = 0 = 0

4f(x_{1} ) = 4f(\frac{\pi }{8} )=\frac{\pi^{2}\sqrt{\frac{1}{2}-\frac{\sqrt{2} }{4}   }  }{16} = 0.23605838

2f(x_{2} ) = 2f(\frac{\pi }{4} )=\frac{\sqrt{2\pi^{2}  } }{16} = 0.87235802

4f(x_{3} ) = 4f(\frac{3\pi }{8} )=\frac{9\pi^{2}\sqrt{\frac{\sqrt{2} }{4}-\frac{{1} }{2}   }  }{16} = 5.12905809

2f(x_{4} ) = 2f(\frac{\pi }{2} )=\frac{\pi ^{2} }{2} = 4.93480220

4f(x_{5} ) = 4f(\frac{5\pi }{8} )=\frac{25\pi^{2}\sqrt{\frac{\sqrt{2} }{4}-\frac{{1} }{2}   }  }{16} = 14.24738359

2f(x_{6} ) = 2f(\frac{3\pi }{4} )=\frac{9\sqrt{2\pi^{2}  } }{16} = 7.85122222

4f(x_{7} ) = 4f(\frac{7\pi }{8} )=\frac{49\pi^{2}\sqrt{\frac{1}{2}-\frac{\sqrt{2} }{4}   }  }{16} = 11.56686065

f(x₈) = f(b) = f(π) = 0 = 0

Finally, just sum up the above values and multiply by Δx/3 = π/24:

π/24 (0 + 0.23605838 + 0.87235802 + 5.12905809 + 4.93480220 + 14.24738359 + 7.85122222 + 11.56686065 = 5.869246855

7 0
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Find the slope for 11-12
Rama09 [41]

Step-by-step explanation:

To find the gradient:

y2-y1/x2-x1

Pick any two coordinates

11)

(4,3) and (1,-1)

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12)

(0,1) and ( 2,-2)

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2-0= 2

-3/2= -1.5

Might be wrong but this is what I got from what I have learnt.

Hope this helps! :)

6 0
3 years ago
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