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
Katena32 [7]
3 years ago
9

Study the equation. x² + 6x = - 4

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

Answer:

x = -3+√5,  -3-√5 (exact roots)

or  x = -0.76, -5.24   to the nearest hundredth.

Step-by-step explanation:

x² + 6x = - 4

Completing the square:

(x + 3)^2 - 9 = -4

(x + 3)^2 = 5

x + 3 = +/-√5

x = - 3 + √5, - 3 - √5

You might be interested in
Watch help video
KengaRu [80]

Answer: There’s a .35 % chance that the marble will be green. When drawing all 3, the chance is .04%

Step-by-step explanation:

8 0
3 years ago
In a statistics​ class, the standard deviation of the heights of all students was 3.8 inches. The standard deviation of the heig
goblinko [34]

Answer:

The reason why standard deviation of the entire class is greater than standard deviation of males and females considered separately, is that mean values for males and females are different from each other.

Step-by-step explanation:

The concept of mean is well represented by the following formula

mean = \frac{(x1 + x2 + x3 + ..... + xn)}{N}, where x1, x2, xn are the observations and N is the number of observations (population).

Standard deviation represents the distance between each observation and the mean of the population (all observations). The formula for this parameter is:

Standard deviation =√[((x1 - x)² + (x2-x)² + ....+ (xn-x)²)/N-1], where x1, x2,..., xn are the observations and x is the mean value.

In this case you have that each height registered is an observation and the number of observations represents the N value. As you can see if the mean for males is different from that of females their standard deviation will be different too. Usually males have heigths greater than that of females (1.77 vs 1.64, in USA for example), and heights inside each group will be more similar than between groups. Then, when you mix all observation there will be an increase in standard deviation, because you are mixing very different heigths

4 0
3 years ago
A student received a coupon for 17% off the total purchase price at a clothing store. Let c be the
lys-0071 [83]
C - 0.17c = 0.83c
When you write “c” at the start, or x or whatever, it has an understood (invisible) number 1. So you’re subtracting the decimal on the next variable from 1.
7 0
3 years ago
PLEASE HELPPP
balu736 [363]
DI’m pretty sure it’s
6 0
3 years ago
Can someone help me pls
FrozenT [24]
There are 4 lateral faces that are triangles.  Each triangle is: A = \frac{b  x  h}{2}
A = \frac{16  x  22}{2}
   = 176

There is one base that is a square. A = L x W
A = 16 x 16
   =  256

Surface area = 256 + 4(176)
                     =  256 + 704
                     = 960

Answer: B

8 0
3 years ago
Read 2 more answers
Other questions:
  • a yard is equal in length to three feet. the function f(y) takes a measurement in yards (as input) and returns a measurement in
    11·1 answer
  • The sum of 3 consecutive odd numbers is 51 <br><br><br> What is the second number in this sequence
    10·1 answer
  • Can someone please help me with this problem
    11·1 answer
  • Round this to the nearest hundredth place please!!!
    12·1 answer
  • DEF rotates 90 degrees clockwise about point A to create D’E’F. Therefore, which equation must be true
    8·1 answer
  • It takes 48 minutes for 7 people to paint 7 walls. How many minutes does it take 20 people to paint 20 walls?
    5·2 answers
  • Please help me find the correct answer.
    9·1 answer
  • MATH QUESTION HELP ME PLS, KINDA URGENT!!
    11·2 answers
  • H + 5.4 = −5.4 <br><br><br><br><br> pls help if you know
    10·2 answers
  • Four points are always coplanar if they: check all that apply.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!