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
Elan Coil [88]
3 years ago
7

Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2+7x+8

Mathematics
2 answers:
mote1985 [20]3 years ago
7 0
x_v=-\frac{b}{2a}\\
x_v=-\frac{7}{2\cdot(-9)}\\
x_v=\frac{7}{18}\\
Verdich [7]3 years ago
4 0
f(x)=-9x^2+7x+8\\\\a=-9;\ b=7;\ c=8\\\\x_{vertex}=\frac{-b}{2a}\\\\x_{vertex}=\frac{-7}{2\cdot(-9)}=\frac{-7}{-18}=\frac{7}{18}
You might be interested in
Point JJJ is located at (-4, 4)(−4,4)left parenthesis, minus, 4, comma, 4, right parenthesis. Select all of the following that a
In-s [12.5K]

Answer:

(-4, 8), (-4, 0), (0, 4) and (-4, 0)

Step-by-step explanation:

Given that point J is located at (-4, 4). The point4 units from point J can either be up, down, left or right. Hence:

The point 4 units up of point J = (-4, 4 + 4) = (-4, 8)

The point 4 units down of point J = (-4, 4 - 4) = (-4, 0)

The point 4 units right of point J = (-4 + 4, 4) = (0, 4)  

The point 4 units left of point J = (-4, 4 - 4) = (-4, 0)

Therefore the points that are 4 units from point  J are (-4, 8), (-4, 0), (0, 4) and (-4, 0).

8 0
3 years ago
I’m really stuck on this one if you can help i’d really appreciate it
Lynna [10]

you're correct. its to take out the greatest common factor.

8 0
3 years ago
Read 2 more answers
Find the surface area of the figure.<br> PLEASE HELP!
olya-2409 [2.1K]

Answer:

The total surface area is: 468 in^2  which agrees with answer a)

Step-by-step explanation:

The three lateral faces of the prism are rectangles, and the sums of their areas give:

12 * 10 + 9 * 10 + 15 * 10 = 360 in^2

The area of each triangular base (notice it is a right triangle) is given by:

9 * 12 / 2 = 54 in^2, so we add TWO of these to the three rectangular faces:

Total surface = 360 in^2 + 2 * 54 in^2 = 468 in^2

6 0
3 years ago
The radius of a right circular cone is increasing at a rate of 1.4 in/s while its height is decreasing at a rate of 2.8 in/s. At
zepelin [54]

Answer:

34191.7πin³/sec

Step-by-step explanation:

Volume of circular come = 1/3pi x r² x h

When we differentiate this formula we have

dv/dt = 1/3π[r²dh/dt + 2rhdr/dt]

We have the following information

r = 138

H = 143 inch

dr/dt = 1.4

dh/dt = -2.8

When we plug into the formula

1/3π[130² x -2.8 + 2x138x143x1.4]

= 34191.7πin³/sec

7 0
3 years ago
How to do this question
RoseWind [281]
Idek hun I don’t see anything
3 0
3 years ago
Other questions:
  • Kelly purchased a tablet that was 20% off the regular price of $1,000. If an
    11·1 answer
  • Between Ahmedabad, Bombay, and Calcutta, there are the following highways: Ahmedabad – Bombay, Ahmedabad – Calcutta, and Bombay
    8·1 answer
  • C. y<br> D. y&lt;3x+2 <br><br> PLEASE ANSWER ASPAP!
    7·1 answer
  • Find the slope of the line passing through (9, -6 ) and (5, 10)​
    13·1 answer
  • The graph of g(x) contains the point (7,12). What point must be on the graph of the function f(x) if g(x) = 2f(x-3)+4?
    12·1 answer
  • A graphing calculator display 1.89x10^12 as 1.89E 12. how do you think it would display 1.89x10-12? what does the E stand for.
    6·1 answer
  • What is the intersection of AC and plane Q?
    14·1 answer
  • Please help faster all these three correct yes or no answer only if you know or I will report you I would like an expert or abov
    9·1 answer
  • Can you guys helps me real quick please the answer is not 2
    10·2 answers
  • A system of equations is shown. y = 2x - 7 y = -x + 5 What is the solution to the system of equations? Please Show your work
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!