1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
UNO [17]
2 years ago
7

Whoops i forgot to read the lesson :P 30 points

Mathematics
1 answer:
andriy [413]2 years ago
6 0

Step-by-step explanation:

I'll do 2.

Alright,Alex let say we have factored a quadratic into two binomial, for example

(5x + 3)(6x - 4)

If we set both of those equal to zero

(5x + 3)(6x + 4) = 0

We can used the zero product property in this case to find the roots of the quadratic equation.

This means that

if  \: ab = 0 \: then \: a = 0 \: and \: b = 0

This means we set each binomal equal to zero to find it root.

5x + 3 = 0

5x =  - 3

x =  -  \frac{3}{5}

6x + 4 = 0

6x =  - 4

x =  -  \frac{2}{3}

So our roots are negative 3/5 and negative 2/3 using zero product property

You might be interested in
You are asked to do a study of shelters for abused and battered women to determine the necessary capacity in your city to provid
ohaa [14]

Answer:

Using the normal probability distribution, with a capacity of 350, it is enough for all abused on 90.82% of nights.

274 shelters will be needed.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 250, \sigma = 75

If the city’s shelters have a capacity of 350, will that be enough places for abused women on 95% of all nights?

What is the percentile of 350?

This is the pvalue of Z when X = 350.

Z = \frac{X - \mu}{\sigma}

Z = \frac{250 - 150}{75}

Z = 1.33

Z = 1.33 has a pvalue of 0.9082.

Using the normal probability distribution, with a capacity of 350, it is enough for all abused on 90.82% of nights.

If not, what number of shelter openings will be needed?

The 95th percentile, which is X when Z = 1.645. So

Z = \frac{X - \mu}{\sigma}

1.645 = \frac{X - 150}{75}

X - 150 = 1.645*75

X = 274

274 shelters will be needed.

5 0
2 years ago
Which statements about a square are always true?
blondinia [14]
All of the answers are correct except the last one
6 0
2 years ago
Read 2 more answers
Ken started a savings account for school. He plans on spending 10% of the money he earns for leisure activities. He needs to hav
KiRa [710]

Answer:

He must earn $2,400 to cover both leisure and $2,160 for school expenses.

Step-by-step explanation:

Let the total amount Ken must earn be k.  Then 10% of that would cover leisure activities and the remaining 90% specifically for school expenses.

Then 0.90k = $2,160, and k = $2,400.

He must earn $2,400 to cover both leisure and $2,160 for school expenses.

7 0
3 years ago
Describe how to round 3.987 to the nearest tenth.​
Inga [223]

Answer:

4

Step-by-step explanation:

You see the hunderth digit has a 8, so you round up. 0.9+0.1=1 so you add 1 to 3, so 3.987 rounded is 4

4 0
3 years ago
Read 2 more answers
An 18 pound turkey cooks for 4.5 hours. How long will it take for a 12 pound turkey to cook?
OverLord2011 [107]

Answer:

3 hours

Step-by-step explanation:

We can solve using ratios

18 lbs            12 lbs

------------ = --------------

4.5 hrs          x hours

Using cross products

18x = 12 * 4.5

18x = 54

Divide by 18

18x/18 = 54/18

x=3

6 0
3 years ago
Read 2 more answers
Other questions:
  • Help with inscribed polygons. Me and my daughter do not understand this.
    8·1 answer
  • A bucket full of milk is 80cl,how many litres are in 15 of such​
    9·1 answer
  • Consider the level surface given by
    6·1 answer
  • in the figure below ac is a diameter of circle p. The radius of circle p is 30 units. The arc length of bc is 13pi .​
    6·1 answer
  • Can someone help me???
    13·1 answer
  • Is the LCM ( least common multiple) of two numbers ( always,sometimes,never) the product of the two numbers?
    6·1 answer
  • Which formula gives the zeros of y = sin(x)
    14·1 answer
  • What’s the answer for GCF 55 and 77
    5·2 answers
  • (2x-4)+(5x-13)+(x+4)
    5·2 answers
  • Please help! I'm so confused on this. Ill give brainliest if you can figure these out.
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!