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marshall27 [118]
3 years ago
10

Help please.. look at the image...

Mathematics
1 answer:
vova2212 [387]3 years ago
4 0

Answer: 195 = 35x + 20

Step-by-step explanation: This follows the y = mx + b formula.

y is your total, what the equation equals, and in this case it is your total cost of $195.

x is your independent variable, and time is always independent. When m is $35, you can plug in any hour (time!) for the x.

b is your initial value. This is what you start with, and in this case, it is your $20 equipment fee. You KNOW you have to pay that.

Hope this helps!

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The equation for a parabola has the form y = ax^2 + bz + c, where a, b, and c are constants and aメ0. Find an equation for the pa
vova2212 [387]

Answer:

a = 2, b = -9, c = 3

Step-by-step explanation:

Replacing x, y values of the points in the equation y = a*x^2 + b*x +c give the following:  

(-1,14)

14 = a*(-1)^2 + b*(-1) + c  

(2,-7)

-7 = a*2^2 + b*2 + c  

(5, 8)  

8 = a*5^2 + b*5 + c  

Rearranging:

a - b + c = 14  

4*a + 2*b + c = -7

25*a + 5*b + c = 8

This is a linear system of equations with 3 equations and 3 unknows. In matrix notation the system is A*x = b whith:

A =

1    -1  1

4    2  1

25  5  1

x =

a  

b

c

b =

14

-7

8

Solving A*x = b gives x = Inv(A)*b, where Inv(A) is the inverse matrix of A. From calculation software (I used Excel) you get:

inv(A) =  

0.055555556 -0.111111111   0.055555556

-0.388888889 0.444444444   -0.055555556

0.555555556 0.555555556 -0.111111111

inv(A)*b

2

-9

3

So, a = 2, b = -9, c = 3

5 0
3 years ago
What is 6.30 rounded to the nearest tenth?
Lady_Fox [76]
It's rounded to 6.3
:)
3 0
3 years ago
Read 2 more answers
Find the value of x 2x-1 /3x-7​
fiasKO [112]

Answer:

x=-6

Step-by-step explanation:

2x-1=3x-7

2x-3x=-7+1

x=-6

6 0
2 years ago
Which number is a solution to the inequality? m > 2/3
andrew11 [14]
C. 1
It's because 2/3 is equal to 0.6666667
1 is the only greater than that since they're all negative options
4 0
3 years ago
I need help plz it is for khan academy
Schach [20]

Answer:

slope = 1

Step-by-step explanation:

Calculate the slope m using the slope formula

m = \frac{y_{2}-y_{1}  }{x_{2}-x_{1}  }

with (x₁, y₁ ) = (- 1, 0) and (x₂, y₂ ) = (0, 1)

m = \frac{1-0}{0+1} = 1

7 0
3 years ago
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