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4 years ago

What is the probability that out of 400 babies born, 205 or fewer will be girls?

Mathematics

2 answers:

MaRussiya [10]4 years ago

8 0

Answer: 70.9%

Step-by-step explanation:

A P E X

Sunny_sXe [5.5K]4 years ago

4 0

Since they’re equal probability, 205/400 = 51.25%. There’s a 51.25%

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What are the steps to answer 3(d-8)-5=9(d+2)+1

Elena L [17]

First expand $3\left(d-8\right)-5$

$\mathrm{Distribute\:parentheses\:using}:\ \:a\left(b+c\right)=ab+ac$
$Where\; a=3,\:b=d,\:c=-8$

$3\cdot \:d+3\left(-8\right) \ \textgreater \ \mathrm{Apply\:minus-plus\:rules} \ \textgreater \ +\left(-a\right)=-a \ \textgreater \ 3d-3\cdot \:8$

$\mathrm{Multiply\:the\:numbers:}\:3\cdot \:8=24 \ \textgreater \ 3d-24 \ \textgreater \ 3d-24-5$

$\mathrm{Subtract\:the\:numbers:}\:-24-5=-29 \ \textgreater \ 3d-29$

Now expand $9\left(d+2\right)+1$

$\mathrm{Distribute\:parentheses\:using}:\ \:a\left(b+c\right)=ab+ac$
$Where\; a=9,\:b=d,\:c=2$

$9\cdot \:d+9\cdot \:2 \ \textgreater \ \mathrm{Multiply\:the\:numbers:}\:9\cdot \:2=18 \ \textgreater \ 9d+18$

$9d+18+1 \ \textgreater \ \mathrm{Add\:the\:numbers:}\:18+1=19 \ \textgreater \ 9d+19$

Now we have $3d-29=9d+19$

$\mathrm{Add\:}29\mathrm{\:to\:both\:sides} \ \textgreater \ 3d-29+29=9d+19+29 \ \textgreater \ \mathrm{Simplify}$

$3d=9d+48 \ \textgreater \ \mathrm{Subtract\:}9d\mathrm{\:from\:both\:sides} \ \textgreater \ 3d-9d=9d+48-9d$

$Simplify\;again\; \ \textgreater \ -6d=48 \ \textgreater \ \mathrm{Divide\:both\:sides\:by\:}-6 \ \textgreater \ \frac{-6d}{-6}=\frac{48}{-6}$

$Simplify\;once\;more\;\ \textgreater \ d=-8$

Hope this helps!

8 0

3 years ago

Simplify to create an equivalent expression. 2(−n−3)−7(5+2n)

scoray [572]

First you distribute...
-2n - 6 - 35 - 14n
Then you simplify...
-16n - 41
Done

5 0

3 years ago

12 Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used. Match the functions with their periods

agasfer [191]

Answer:

Just use a calculator

Step-by-step explanation:

It's easier :)

4 0

2 years ago

What are the solutions to the equation (2x – 5)(3x – 1) = 0?

Simora [160]

x = 5/2 or x = 1/3

C is the answer.

8 0

3 years ago

Read 2 more answers

Iiii needdd helppp withhh thisss

Alchen [17]

It's an upside (-) down parabola. The axis of symmetry is the x coordinate of the vertex.

you can easily find this using formula: x= -b/2a
for parabola: ax² + b + c = 0
x = -16 ÷ 2(-4)
x = 2
Answer C

4 0

4 years ago