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
tiny-mole [99]
2 years ago
7

URGENT PLEASE HELP!!

Mathematics
1 answer:
Lostsunrise [7]2 years ago
3 0

Answer:

the answer I got is a=-the sign and but 2b under it +7

You might be interested in
frank and his family drove 6 hours every day during a road trip which graph best represents y the total of hours driven in x day
Marta_Voda [28]

Answer:Where is the graph?

Step-by-step explanation:

6 0
3 years ago
What is the equation of the axis of symmetry for the parabola y= 1/4(x+2)^2-7
Nezavi [6.7K]
Your answer is -2 as the axis of symmetry is at -b/2a. So if you were to expand the equation, you would get y= x^2/4 +x -6 where b is 1 and 2a is ½ . Therefore -1 / ½ gives you -2
7 0
3 years ago
The manufacturer of hardness testing equipment uses​ steel-ball indenters to penetrate metal that is being tested.​ However, the
kumpel [21]

Answer:

Check the explanation

Step-by-step explanation:

Let X denotes steel ball and Y denotes diamond

\bar{x_1} = 1/9( 50+57+......+51+53)

=530/9

=58.89

\bar{x_2}= 1/9( 52+ 56+....+ 51+ 56)

=543/9

=60.33

difference = d =(60.33- 58.89)

=1.44

s^2=1/n\sum xi^2 - n/(n-1)\bar{x}^2

s12 = 1/9( 502+572+......+512+532) -9/8 (58.89)2

=31686/8 - 9/8( 3468.03)

=3960.75 - 3901.53

=59.22

s1 = 7.69

s22 = 1/9( 522+ 562+....+ 512+ 562) -9/8 (60.33)2

=33295/8 - 9/8 (3640.11)

=4161.875 - 4095.12

=66.75

s2 =8.17

sample standard deviation for difference is

s=\sqrt{[(n1-1)s_1^2+ (n2-1)s_2^2]/(n1+n2-2)}

 = \sqrt{[(9-1)*59.22+ (9-1)*66.75]/(9+9-2)}

= \sqrt{1007.76/16}

=7.93

sd = s*\sqrt{(1/n1)+(1/n2)}

=7.93*\sqrt{(1/9)+(1/9)}

=7.93* 0.47

=3.74

For 95% confidence level Z (\alpha /2) =1.96

confidence interval is

d\pm Z(\alpha /2)*s_d

=(1.44 - 1.96* 3.75 , 1.44+1.96* 3.75)

=(1.44 - 7.35 , 1.44 + 7.35)

=(-2.31, 8.79)

There is sufficient evidence to conclude that the two indenters produce different hardness readings.

3 0
3 years ago
HELP PLZS FAST BRAINIEST
kirill115 [55]

Answer:

x=-2, y=-2. (-2, -2).

Step-by-step explanation:

2x-5y=6

-2x+10y=-16

-------------------

5y=-10

y=-10/5=-2

2x-5(-2)=6

2x+10=6

2x=6-10

2x=-4

x=-4/2=-2

3 0
2 years ago
Read 2 more answers
Is number 4 correct?
Strike441 [17]

Answer:

sure

Step-by-step explanation:

6 0
2 years ago
Other questions:
  • Find the volume in cm³ of a length of pipe which has these measurements. Volume of a cylinder = πr²h π = 3.14.
    9·2 answers
  • A box with 3 metal balls weighs 1840 kg.
    9·1 answer
  • Find unit rate 3 notebooks for $6.99
    10·2 answers
  • What is the equation of the line that is parallel to the line 5x + 2y = 12 and passes through the point (−2, 4)?
    12·1 answer
  • The monthly salary of workers in the public works department is $1,500, $3,000, $3,500, $3,500, $4,000, $4,500, $5,000, $6,000,
    15·1 answer
  • Find the product in simplest form. (3√2) ( √10) 3 √10 3 √20 6 √5 6 √10
    8·1 answer
  • The elephants at the zoo eat 3 2/3 buckets of bananas each day. The zookeeper bought 7 1/3 buckets of bananas. How many days wil
    14·1 answer
  • Share 350m in the ratio of 3:7​
    9·2 answers
  • What is the reduced fraction form of 0.2
    14·1 answer
  • enkeli has a bottle that holds 2.4 liters of juice. he divides it evenly into 6 cups. how many milliliters of juice does each of
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!