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2 years ago

7

There are 300 students in the 6th grade class, 4 are running for class president. Which type of survey below would give valid re

sults?
A. survey three 6th graders
B. survey six 6th graders
C. survey ten 6th grades
D. survey thirty 6th grades

1 answer:

Vera_Pavlovna [14]2 years ago

7 0

Answer:

D. survey thirty 6th grades

Step-by-step explanation:

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Factor: a^2+b^2–c^2+2ab

Kruka [31]

Rearrange the polynomial:

a^2–2ab+b^2 - c^2

((a-b)(a-b))-c^2

(a-b)^2-c^2

Set x =a-b and y=c. The formula becomes

x^2-y^2

factoring this polynomial, we get

(x+y)(x-y)

Substituting back, we get:

(a+b+c)(a+b-c)

Let’s multiply it out to check:

A^2 -ab ac

- ab B^2 -bc

-ac bc -c^2

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3 years ago

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How many inches are in 35 feet?

soldier1979 [14.2K]

Answer:

420 inches

Step-by-step explanation:

There are twleve inches in one foot.

(35) (12) = 420

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3 years ago

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Write the slope intercept form of the equation of the line through the given point with the given slope

liraira [26]

Answer:

y = -3/7 x + 41/7

Step-by-step explanation:

The Slope (m) is -3/7

y= mx+ b

They y intercept passing through the pt. (-2,5 ) is

5 = -3/7(2) +b

5 = -6/7 +b

b= 41/7

y = mx +b

y = -3/7 x + 41/7

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2 years ago

The weights of certain machine components are normally distributed with a mean of 5.19 ounces and a standard deviation of 0.05 o

Brums [2.3K]

Answer:

The weight that separate the top 8% by 5.2605 and the weight that separate bottom 8% by 5.1195.

Step-by-step explanation:

We are given that

Mean, $\mu=5.19$

Standard deviation, $\sigma=0.05$

We have to find the two weights that separate the top 8% and the bottom 8%.

Let x1 and x2 the two weights that separate the top 8% and the bottom 8%.

Z-value for p-value =0.08 = $-1.41$

For 8% bottom

$Z=\frac{x_1-\mu}{\sigma}=-1.41$

$\frac{x_1-5.19}{0.05}=-1.41$

$x_1-5.19=-1.41\times 0.05$

$x_1=-1.41\times 0.05+5.19$

$x_1=5.1195$

For 8% top

p-Value=1-0.08=0.92

Z- value=1.41

Now,

$\frac{x_2-5.19}{0.05}=1.41$

$x_2-5.19=1.41\times 0.05$

$x_2=1.41\times 0.05+5.19$

$x_2=5.2605$

(x1,x2)=(5.1195,5.2605)

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3 years ago

Seven less than a the ratio of six and a number?

icang [17]

It is 4 I believe sorry if I’m wrong

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2 years ago