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
aliya0001 [1]
3 years ago
8

the line of symmetry of a parabola whose equation is y = ax ^ 2 - 4x + 3 is =-2 what is the value of "a"

Mathematics
1 answer:
77julia77 [94]3 years ago
5 0
Y= ax² -4x +3

-b/2a is x - coordinate of the vertex,
line of symmetry x=-2, x=-2 is a coordinate of the vertex also, because the line symmetry has vertex.

x= -b/2a
x= -2, b= -4
-2=-(-4)/2a
-2=4/2a
-2=2/a
a=2/(-2)=-1
a= - 1 
You might be interested in
Find the exact value of sec theta if csc theta = -4/3 and the terminal side of theta lies in quadrant III
GREYUIT [131]

Answer:

-4 sqrt(7)/7

Step-by-step explanation:

csc theta = -4/3

csc theta = hypotenuse / opposite side

hypotenuse = 4  

opposite  = 3

Using the pythagorean theorem

a^2 + b^2 = c^2

3^2 + b^2 = 4^2

9+b^2 = 16

b^2 = 16-9

b^2 = 7

Taking the square root

sqrt(b^2) = sqrt(7)

b = sqrt(7)

We are in the third quadrant so only tan  and cot are positive

that means the x and y values are "negative"  so a = -3 and b = - sqrt(7)

sec theta = hypotenuse / adjacent

                = 4/ - sqrt(7)

rationalizing  

                   -4 sqrt(7)/ sqrt(7)* sqrt(7)

                = -4 sqrt(7)/7

           

3 0
3 years ago
Aaaaaaaaaaaaaaaaaaaaaaaaaa
Georgia [21]

Answer:

thank you for the points

Step-by-step explanation:

fr

7 0
2 years ago
Read 2 more answers
Southern Florida has a mild climate. Which statement about the probability of snow in June in southern Florida is most likely tr
Allisa [31]

Answer:

The probability of snow is about 0.75

Step-by-step explanation:

5 0
3 years ago
A test to detect an infection gives a positive result 98% of the time if a person is infected. It is 97% accurate for people who
sergeinik [125]
Consider this:

If a test gives a positive result for an infected person 98% of the time, that means that 2% of the time, it gives a negative result for an infected person, which would be a false negative.

Then,

if the test is 97& accurate (not precise) for non-infected people, that means that it gives a negative result 97& of the time. So a positive result will be given 3% of the time for non-infected people, which is considered a false positive.
5 0
3 years ago
Read 2 more answers
Simplify this expression, you are y years old. Your sister is 3 years older than you. Your uncle is 4 times older than your sist
uysha [10]

Answer:The simplified expression that represents the uncle's age is

4y + 12

Step-by-step explanation:

Let y represent your age.

Your sister is 3 years older than you. This means that your sister's age is y + 3

Your uncle is 4 times older than your sister. It means that the age of your uncle would be

4(y + 3)

The simplified expression that represents your uncle's age would be

4y + 12

8 0
3 years ago
Other questions:
  • Slope intercept form write an equation
    6·2 answers
  • You get $84 each month from your mom for your cell phone bill.
    14·1 answer
  • 5/8 x 10/3 pls help i hate math
    8·2 answers
  • ☝☝and the sum too? Please help
    8·1 answer
  • Jaden is 35 inches tall. He is 4/7 as tall as his brother. How tall is his brother? Round your answer to the nearest inch.
    8·1 answer
  • 8w-8= - 4w + 16 answers please
    5·2 answers
  • Delia can buy 3 sweatshirts for a total of $39. How much would it cost if she were to buy 7 sweatshirts?​
    14·1 answer
  • 0.325 is 100 percent. <br><br>a equal to <br>b greater than <br>c less than ​
    6·1 answer
  • Find the unknown Angles in the given figure<br>​
    5·1 answer
  • What is the solution set to the inequality 5(x - 2)(x + 4) &gt; 0?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!