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3 years ago

The diagram shows two congruent regular polygons joined together.

Mathematics

1 answer:

svlad2 [7]3 years ago

4 0

10 sides

360-72=288
288 divided by 2 is 144
Decagon have 144 degree interior angles

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What is the area that she paints

Andre45 [30]

To determine this, we need to multiply 8 by 36 and 3 by 4 to get the total area.
8 x 36 = 288
3 x 4 = 12

Subtract the two to get the total area she is painting.
288-12 = 276
Your total area is 276 sq ft.
Your answer is D.)
I hope this helps!

6 0

3 years ago

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4/7(21/8 x + 1/2) = -2(1/7 - 5/28x) What is x in decimal form?

frez [133]

Answer:

x= $1.22930$

Step-by-step explanation:

47(218 x+12 ) =−2(17 −528 x)

Simplify 47(218 x+12 ) : 327(21x+4) 327(21x+4) =−2(17 −528 x)

Multiply both sides by 7(21x+4)

327(21x+4) · 7(21x+4)=−2(17 −528 x)· 7(21x+4)

Simplify, 32=−14(17 −528 x)(21x+4)

Solve 32=−14(17 −528 x)(21x+4): x=32+4√589105 , x=32−4√589105 x=32+4√589105 , x=32−4√589105

8 0

3 years ago

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There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the c

Firdavs [7]

I will use the binomial distrubion to find the probability.

$\displaystyle
P(A)=\binom{n}{k}p^k(1-p)^{n-k}$

------------------------------------------------------

A - selecting a red checker exactly 7 times in 10 selections

$n=7\\
k=10$

$\displaystyle
P(A)=\binom{10}{7}\cdot\left(\dfrac{12}{15}\right)^7\cdot\left(1-\dfrac{12}{15}\right)^{10-7}\\\\
P(A)=\dfrac{10!}{7!3!}\cdot\left(\dfrac{4}{5}\right)^7\cdot\left(1-\dfrac{4}{5}\right)^3\\\\
P(A)=\dfrac{8\cdot9\cdot10}{2\cdot3}\cdot\dfrac{16384}{78125}\cdot\left(\dfrac{1}{5}\right)^3\\\\
P(A)=120\cdot\dfrac{16384}{78125}\cdot\dfrac{1}{125}\\\\
P(A)=\dfrac{393216}{1953125}\approx0.2=20\%$

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3 years ago

ASAP..

agasfer [191]

C C C C C C C C is the answer

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3 years ago

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1/6x+42+2/5x-8/3x-19=

DochEvi [55]

(x/6) + 42 + (2x/5) - (8x/3) - 19

Change the denominators (numbers below the fraction bar to a to a common number for the three numbers: 6, 5, and 3... in other words to a number that is divisible by all three numbers)

(5x/30) + (12x/30) - (80x/30) + 23
(-63x/30) + 23

And the answer is.....

(-21x/10) + 23

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4 years ago