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
il63 [147K]
3 years ago
11

Please help, thank you

Mathematics
1 answer:
madam [21]3 years ago
7 0

Answer:

\displaystyle x=\frac{-8\pm\sqrt{(8)^2-4(4)(-221)}}{2(4)}\ \text{; x = 6.5 and x = -8.5}

Step-by-step explanation:

Subtract the right side of the given equation to put it into standard form:

  4x² +8x -221 = 0

Then the coefficients used in the quadratic formula are ...

  • a = 4
  • b = 8
  • c = -221

When these are filled into the form ...

\displaystyle x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

the result is as shown above.

You might be interested in
Evaluate -2a^2 if a = -5/2<br><br> -25<br><br> -12 1/2<br><br> 25 <br><br> 12 1/2
OLEGan [10]
-12.5 or -12 1/2 so easy
5 0
3 years ago
Juan takes 15 hours to do a job that his father can do in 6 hours. If juan works for 4.5 hours before his father joins him, how
ad-work [718]
Work it exactly like the other one with Wilda and Karla.

Juan takes 15 hours to do a job ... he does 1/15 of it in an hour.
His father can do it in 6 hours ... he does 1/6 of it in an hour.

Juan works alone for 4.5 hours.  In that time, he does  4.5/15 = 0.3
of the job.  When his father joins him, there's only 0.7 of it to finish.

Working together, they do (1/15 + 1/6) = (2/30 + 5/30) = 7/30 of the job
each hour.

How many times do they have to do  7/30  of the job in order to finish
the  7/10  of it that remains ?  That will be the number of hours they need.

(7/10) / (7/30) = 7/10 x 30/7 = <em>3 hours</em>.

Then they can knock off while it's still daylight, and go for a swim.
3 0
3 years ago
Solve the system by elimination<br><br> 2 + 5 = −24<br> 3 − 5 = 14
belka [17]

Answer:

7=24

-2 = 14

Step-by-step explanation:

(2+5)= 7=24

8 0
3 years ago
What is the mean absolute deviation of 10 16 18 15 15 10 23
grigory [225]
The answer is 3.1428 (very close to π actually lol)



4 0
3 years ago
Read 2 more answers
I need the answer to this
Arisa [49]

Answer:

Here Is Your Answer Of Your Question and Please Subscribe To Auroza Gaming

4 0
2 years ago
Read 2 more answers
Other questions:
  • 2(3C + 2d) =<br><br><br> I don’t understand
    5·2 answers
  • Please help ahhhhhh!!
    9·2 answers
  • Xavier Martinez took out a $5,000 loan at 7.5% interest for reconstructing his patio. His monthly payment on the 12-month loan w
    6·2 answers
  • Apply the distributive property to create an equivalent expression for (m-3+4n)x(-8)
    5·2 answers
  • Are the expressions 3{y+1} and 3y+3 equivalent for any value? explain
    13·2 answers
  • Linear functions m and p are shown
    13·1 answer
  • Beth has just received an inheritance of $500,000 and would like to be able to make quarterly withdrawals over the next 20 years
    12·1 answer
  • A rental car company charges $30 a day plus $0.05 a mile. Which expression could be used to find the cost of renting a car for m
    14·1 answer
  • A square name tag has sides that are 5 centimeters long. What is the name tag's area?
    15·1 answer
  • 4.6x-9.3=27.5 NEED HELP asap
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!