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2 years ago

Use the discriminant to determine the number of solutions. x2 + x = 12

Mathematics

1 answer:

Sati [7]2 years ago

3 0

Answer:

x=4

Step-by-step explanation: So you do 2x plus 1x which is 3x. Then you divide both sides by 3 which leaves you with x=4. Thats your answer. <3

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Can you use the properties of exponents you discovered to simplify 5^2 · 2^5 ?

Nostrana [21]

5² × 2⁵ = 25 × 32 =. 800

Hope this helps

5 0

2 years ago

48,62,81,94,27 to their nearest tens

monitta

Answer:

50, 60, 80, 100, 30

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

in a given year, the rate of flu infection for the general public was 8.3%. And sample of 200 people who receive the flu vaccine

makkiz [27]

Answer:

$\fbox{\begin{minipage}{10em}Option A is correct\end{minipage}}$

Step-by-step explanation:

Step 1: Define significance level

In this hypothesis testing problem, significance levels α is selected: $0.05$ , the associated z-value from Laplace table:

Φ( $z$ ) = α - $0.5 = 0.05 - 0.5 = -0.45$

=> $z$ = $-1.645$

Step 2: Define null hypothesis ( $H_{0}$ ) and alternative hypothesis ( $H_{1}$ )

$H_{0}$ : rate of flu infection $p$ = 8.3% or 8.3/100 = 0.083

$H_{1}$ : rate of flu infection $p$ < 8.3% or 8.3/100 = 0.083

Step 3: Apply the formula to check test statistic:

$K = \frac{f - p}{\sqrt{p(1 - p)} } * \sqrt{n}$

with $f$ is actual sampling percent, $p$ is rate of flu infection of $H_{0}$ , $n$ is number of samples.

The null hypothesis will be rejected if $K < z$

Step 4: Calculate the value of K and compare with $z$

$K = \frac{(\frac{3.5}{100}) - 0.083}{\sqrt{0.083(1 - 0.083)} } * \sqrt{200} = -2.46$

We have $-2.46 < -1.645$

=>This is good evidence to reject null hypothesis.

=> The actual rate is lower. (As $H_{1}$ states)

Hope this helps!

5 0

2 years ago

MULTIPLE CHOICE QUESTION

Lostsunrise [7]

Answer: C. 4

Step-by-step explanation:

First, we can prime factorize 52.

52 = 2^2 * 13

13 is not a square number, but 4 is a square number because it equals 2 squared.

Therefore, the correct answer is C. 4

5 0

2 years ago

Laura just finished a new book about a time-traveling magician. She read the same amount every day and completed the book in jus

svp [43]

So you have 85 pages and 10 days.
You would do 85/10 to get 8.5 pages each day. Hope that’s right !

5 0

1 year ago