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
liubo4ka [24]
3 years ago
10

Please help me this is from khan academy :(((

Mathematics
1 answer:
Dmitrij [34]3 years ago
6 0

Answer:

y=1.4x+6.8

Step-by-step explanation:

(-2;4) (-7;-3)

4=-2k+b

-3=-7k+b

7=5k

k=1.4

-2.8+b=4

b=6.8

I already know k and b so I can write an equation.

y=1.4x+6.8

You might be interested in
A lake polluted by bacteria is treated with an antibacterial chemical. Aftertdays, thenumber N of bacteria per milliliter of wat
jeyben [28]

Answer:

N(1)=50 is a minimum

N(15)=4391.7 is a maximum

Step-by-step explanation:

<u>Extrema values of functions </u>

If the first and second derivative of a function f exists, then f'(a)=0 will produce values for a called critical points. If a is a critical point and f''(a) is negative, then x=a is a local maximum, if f''(a) is positive, then x=a is a local minimum.  

We are given a function (corrected)

N(t) = 20(t^2-lnt^2)+ 30

N(t) = 20(t^2-2lnt)+ 30

(a)

First, we take its derivative

N'(t) = 20(2t-\frac{2}{t})

Solve N'(t)=0

20(2t-\frac{2}{t})=0

Simplifying

2t^2-2=0

Solving for t

t=1\ ,t=-1

Only t=1 belongs to the valid interval 1\leqslant t\leqslant 15

Taking the second derivative

N''(t) = 20(2+\frac{2}{t^2})

Which is always positive, so t=1 is a minimum

(b)

N(1)=20(1^2-2ln1)+ 30

N(1)=50 is a minimum

(c) Since no local maximum can be found, we test for the endpoints. t=1 was already determined as a minimum, we take t=15

(d)

N(15)=20(15^2-2ln15)+ 30

N(15)=4391.7 is a maximum

7 0
3 years ago
Help!!! I just need Help on number 6 please!!!!!!!! ASAP!!!
PtichkaEL [24]

Answer:

3

Step-by-step explanation:

\sqrt{12} =3.46 (2 decimal places)

If you want to arrange the tiles into a square, you will need 3.46 in each row/column.

This is physically impossible, hence you round it down to 3.

(If you round it up, you won't have enough tiles since 4*4=16)

Thus, the square area will be 3*3=9

Tiles left: 12-9=3

6 0
3 years ago
Divide the complex numbers
Otrada [13]

Answer:

1/4 - 1/3i

Step-by-step explanation:

(4+3i)(-i) / 12i(-i)

= 3 - 4i / 12

3 0
3 years ago
FIND THE DEGREE MEASURE OF ANGLE DPR.
SVETLANKA909090 [29]

\widehat{DPR}=\frac{1}{2}(\stackrel\frown{ET}-\stackrel\frown{DR}) =  \frac{1}{2} (118 - 26) =  \frac{92}{2}  = 46°

4 0
3 years ago
a scientist from chile has transported volcanic ash samples to be tested in his lab if the scientist has 3540 grams of volcanic
Digiron [165]
3,540 grams of ash
If its density is 2.75 g/cc and
density = mass / volume then its volume is

volume = mass / density
volume = 3,540 g / 2.75 g / cc
volume = <span> <span> <span> 1287.272727 cc
So, rounded it is 1,287.3 cubic centimeters but to keep the same number of significant figures, the volume is
</span></span></span>volume = <span> <span> <span> 1,287 cc</span></span></span>


7 0
3 years ago
Other questions:
  • What is the answer to the picture below
    6·1 answer
  • Multiply and simplify. (x - 3)(x2 + 3x + 9)
    13·2 answers
  • I need help with with problem please thanks!
    12·1 answer
  • 160+3x=195-2x what is the answer
    14·2 answers
  • The first hexagon is dilated to form the second hexagon. Select answers from the drop-down menus to correctly complete the state
    8·2 answers
  • Which transformation(s) were used to go from the parent graph (red) to the transformed graph (blue)? Check all that apply!
    6·1 answer
  • Does anyone know the answer to this?
    9·1 answer
  • HELP!! I will give brainliest to best answer! :))
    6·2 answers
  • A department manager recently launched a new initiative so the members of her department can more easily present innovative idea
    9·1 answer
  • Help me please, you gonna be my hero
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!