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Leya [2.2K]
3 years ago
15

In a random and independent sample of 1000 students 80% of them were in favor of longer hours at the school library.

Mathematics
1 answer:
Semmy [17]3 years ago
5 0

Answer:

20 MOE

Step-by-step explanation:

yes

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Choose the inverse of y = x2 - 10x.
PilotLPTM [1.2K]

=Y2-10Y

We move all terms to the left:

-(Y2-10Y)=0

We add all the numbers together, and all the variables

-(+Y^2-10Y)=0

We get rid of parentheses

-Y^2+10Y=0

We add all the numbers together, and all the variables

-1Y^2+10Y=0

a = -1; b = 10; c = 0;

Δ = b2-4ac

Δ = 102-4·(-1)·0

Δ = 100

The delta value is higher than zero, so the equation has two solutions

We use following formulas to calculate our solutions:

Y1=−b−Δ√2aY2=−b+Δ√2a

Δ‾‾√=100‾‾‾‾√=10

Y1=−b−Δ√2a=−(10)−102∗−1=−20−2=+10

Y2=−b+Δ√2a=−(10)+102∗−1=0−2=0

3 0
3 years ago
What is 1 and 1/2% of 400?
aniked [119]
\bf {{ a}}\%\ of\ b \implies  \cfrac{{{ a}}}{100}\cdot b\implies {{ a}}\div 100\cdot b\\\\
-----------------------------\\\\
thus
\\\\

\begin{cases}
{{ 1}}\%\ of\ 400 \implies  \cfrac{{{ 1}}}{100}\cdot 400\implies {{1}}\div 100\cdot 400\\
--------------\\
{{ \frac{1}{2}}}\%\ of\ 400 \implies  \cfrac{{{ \frac{1}{2}}}}{100}\cdot 400\implies {{\frac{1}{2}}}\div 100\cdot 400
\end{cases}

you tell us
3 0
3 years ago
What is the equation of the line that passes through the point (-6, -2) and has a
Westkost [7]

Answer:Question 135184: Find the equation of the line with slope 6 that goes through the point (6,4). Write your answer in slope-intercept form. b=-32 ANSWER FOR THE Y INTERCEPT. Y=6X-32 LINE EQUATION

Step-by-step explanation:

5 0
2 years ago
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A circular swimming pool is installed in a rectangular shaped backyard. An underwater light is placed as its center, 16 feet fro
Daniel [21]
What is the question?
8 0
3 years ago
Macy has a circular garden that has a radius of 9 meters. What is the circumference of her garden? Use 3.14 for pi.
olga2289 [7]

Answer:

c

Step-by-step explanation:

i am 99.99% sure it is c

6 0
3 years ago
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