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3 years ago

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In zanders class,80% of the students are girls. There are 24 girls in the class. What is the total number of students in Zander'

s class?
A. 30
B.34
C.40
D.80

1 answer:

lana [24]3 years ago

5 0

Answer:

A. 30

Step-by-step explanation:

30*.08=24

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One number is six more than a second number. four times the first is 10 less than 6 times the second. Find the numbers.

zavuch27 [327]

$\sf{\bold{\blue{\underline{\underline{Given}}}}}$

One number is six more than a second number.
four times the first is 10 less than 6 times the second.⠀⠀⠀⠀

$\sf{\bold{\red{\underline{\underline{To\:Find}}}}}$

Find the two numbers.⠀

$\sf{\bold{\purple{\underline{\underline{Solution}}}}}$

⠀⠀⠀⠀

In questions given,One number is six more than a second number.

if second number is a

first number is a+6.

and,

four times the first is 10 less than 6 times the second.

So,

4×(a+6)=6a-10

we have to solve this.

$\bold{4\times (a+6)=6a-10 }$

$\bold{4a+24=6a-10 }$

$\bold{6a-4a=24+10 }$

$\bold{2a=34 }$

$\bold{ a=\dfrac{34}{2} }$

$\bold{ a=17 }$

we,get our second number =a=17.

So,

first number =a+6=17+6=23

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3 years ago

The diameter of a circle is 34 yards. What is the circle's area? Use 3.14 for .

barxatty [35]

Answer:

907.46 mm2

Step-by-step explanation:

Area of circle = (¶d^2)/4

d = 34 mm

Therefore

Area A = (3.14 x 34^2)/4

= 907.46 mm2

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2 years ago

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If √(0.09×0.09×x) = 0.09 × 0.09×√z, then the value of x/y is____.

OLEGan [10]

Given that-

√(0.09×0.09×x) = 0.09×0.09×√z

On squaring both sides then

⇛[√(0.09×0.09×x) ]² = (0.09×0.09×√z)²

⇛ 0.09×0.09×x= (0.09)²×(0.09)²×(√z)²

⇛ (0.09)² × x = (0.09)²×(0.09)²×z

⇛ (0.09)² × x/z = (0.09)²×(0.09)²

⇛x/z = (0.09)²×(0.09)²/(0.09)²

⇛x/z = (0.09)²

⇛x/z = 0.09×0.09

⇛x/z = 0.0081

<u>Answer</u><u>:</u><u>-</u> Hence the value of x/z will be 0.0081 r respectively.

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3 years ago

What are the solutions to the equation?<br><br> 3x^2+6x=45<br><br> Enter your answers in the boxes.

Gnoma [55]

x= 3,-5

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4 years ago

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A random sample of 77 fields of durum wheat has a mean yield of 27.427.4 bushels per acre and standard deviation of 5.755.75 bus

xz_007 [3.2K]

Answer:

[ 21.79, 33.0 ]

Step-by-step explanation:

Given:

Sample size, n = 7

Sample mean, μ = 27.4

Standard deviation, σ = 5.75

Confidence level is 99%

also, population is normal i.e normally distributed

Thus,

Confidence interval = μ ± $z\frac{\sigma}{\sqrt n}$

For confidence level of 99%

z-value = 2.58

Therefore,

Lower limit of Confidence interval = μ - $2.58\times\frac{5.75}{\sqrt{7}}$

or

Lower limit of Confidence interval = 27.4 - $2.58\times\frac{5.75}{\sqrt{7}}$

or

Lower limit of Confidence interval = 21.79

Upper limit of Confidence interval = μ + $2.58\times\frac{5.75}{\sqrt{7}}$

or

Upper limit of Confidence interval = 27.4 + $2.58\times\frac{5.75}{\sqrt{7}}$

or

Upper limit of Confidence interval = 33.00

Hence, confidence interval = [ 21.79, 33.0 ]

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3 years ago