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3 years ago

A quadratic equation with a negative discriminant has a graph that

1 answer:

6 0

D. never crosses the x-axis.
a negative discriminant means the quadratic equation can never equal zero (which is the x-axis)

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Evaluate the expression 5x-y when x=2 and y=4

mariarad [96]

Answer:

Step-by-step explanation:

5 times 2 (×) 10- 4(y)

when a varbile (letter) is besides then you multiply

5 0

3 years ago

A radio talk show host with a large audience is interested in the proportion p of adults in his listening area who think the dri

vekshin1

Answer:

The margin of error for a 90% confidence interval is 0.075.

Step-by-step explanation:

We are given that he asks listeners to phone in and vote "yes" if they agree the drinking age should be lowered and "no" if not.

Of the 100 people who phoned in, 70 answered "yes."

Let $\hat p$ = sample proportion of people who say yes

So, $\hat p=\frac{X}{n}$ = $\frac{70}{100}$ = 0.70

where, X = Number of people who say yes = 70

n = Number of people phoned in = 100

Now, Margin of error formula for any confidence interval is given by;

Margin of error = $Z_(_\frac{\alpha}{2}_ ) \times \text{Standard of Error}$

where, $\alpha$ = level of significance = 10%

Standard of error = $\sqrt{\frac{\hat p(1-\hat p)}{n} }$

Also, the critical value of x at 5% ( $\frac{\alpha}{2} =\frac{0.10}{2}$ ) level of significance is 1.645.

SO, Margin of Error = $1.645 \times \sqrt{\frac{\hat p(1-\hat p)}{n} }$

= $1.645 \times \sqrt{\frac{0.70(1-0.70)}{100} }$

= 0.075

Hence, the margin of error for a 90% confidence interval is 0.075.

8 0

3 years ago

The spinner is divided into 10 equal sections. A spinner divided into 10 equal sections labeled 1 through 10. Which event has th

mr_godi [17]

Answer:

spinning a number less than 3

spinning a 4 or 5

spinning a number greater than 8

Step-by-step explanation:

spinning a number less than 3

P(1 or 2) = number of 1 or 2's / total = 2/10 = 1/5 true

spinning a 4 or 5 spinning

P(4 or 5) = number of 4 or 5's / total = 2/10 = 1/5 true

an odd number

P(odd number) = number of 1,3,5,7,9 s / total = 5/10 = 1/2 false

spinning a number greater than 8

P(9 or 10) = number of 9 or 10's / total = 2/10 = 1/5 true

spinning a number less than 8

P(less than 8) = number of 1,2,3,4,5,6,7's / total = 7/10 = false

5 0

3 years ago

Read 2 more answers

What’s 1 + 1 and why?

MrRa [10]

Answer:

Step-by-step explanation:

you add 1 to 1 and that gives you 2

8 0

3 years ago

Read 2 more answers

How can I solve 3x+6y=19? I need help!

const2013 [10]

You bring the numerals on to the other side of the equation, therefore dividing 19 by 3 and 6.
3x + 6y = 19
3x + y = 19/6
x + y = 3.17/3
x + y = 1.1

7 0

4 years ago