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pishuonlain [190]
3 years ago
10

I save 2.75 pounds a week how much would i save 30 weeks

Mathematics
2 answers:
Marizza181 [45]3 years ago
8 0
The answer would be 82.5
Karo-lina-s [1.5K]3 years ago
7 0
If I’m not wrong it should be 82.5
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At a store Mary please $34 for 2 pounds of apples 1 pound of berries and 4 pounds of chairs Tom pays $35 for 3 pounds of apples
MrRa [10]

Answer:

34 = 2A + 1B + 4C

35 = 3A + 2B+ 2C

49 = 5A + 3B+ 2C

Pairs the 1st and 2nd equation, then eliminates C:

34 = 2A + 1B + 4C

35 = 3A + 2B + 2C

34   =  2A  +  1B + 4C

-70 = -6A + -4B + -4C  <---- multiplies 2nd equation by -2

Adds them together

-36 = -4A + -3B

36 = 4A + 3B  <----- please label this equation ALPHA

Next, pairs the 2nd and 3rd equations, and eliminates C:

35 = 3A + 2B+ 2C

49 = 5A + 3B+ 2C

Subtracts the top equation from the bottom:

49-35 = 5a-3a + 3b-2b + 2c-2c

14 = 2a + b <--- please label this equation BETA

ALPHA: 36 = 4A + 3B

BETA:   14 = 2a + b

Solves the 2x2 system by substitution:

BETA: 14 - 2a = b <---- solves equation BETA for b

Substitutes into equation ALPHA:

36 = 4a + 3(14 - 2a)

36 = 4a + 42 - 6a

36 = 42 - 2a

-6 = -2a

a=3

b = 14 - 2a = 14 - 2(3) = 14 - 6 = 8

34 = 2a + b+ 4c

34 = 2(3)+ 8 + 4c

34 = 6+8 + 4c

34 = 14 + 4c

20 = 4c

c=5

1 pound of apples cost $3

1 pound of berries cost $8

1 pound of cherries cost $5

8 0
3 years ago
If dy/dx = x(y-1), find the equation of the tangent line at x=-2 with f(-2)=3
Lapatulllka [165]

Answer:

The equation of the tangent line passing through the point (-2,3) is

 4 x + y +5 =0

Step-by-step explanation:

<u><em>Step(i):-</em></u>

<em>Given that the slope of the tangent</em>

<em>              </em>m = \frac{dy}{dx} = x(y-1)<em></em>

<em>              m = -2( 3-1) = -4</em>

<em>Given point x = -2</em>

<em>          y = f(-2) =3</em>

<em>∴The given point ( x₁ , y₁) = ( -2 ,3)</em>

<u><em>Step(ii):-</em></u>

The equation of the tangent line passing through the point (-2,3)

y - y_{1} = m(x-x_{1} )

y -3 = -4(x-(-2))

y -3 = -4( x+2)

y-3 = -4x -8

4x + y -3+8=0

4x +y +5=0

<u><em>Step(iii):-</em></u>

<em>The equation of the tangent line passing through the point (-2,3) is</em>

<em>   4 x + y +5 =0</em>

<em></em>

3 0
3 years ago
In order for two lines to be parallel they must have the same
PolarNik [594]

Answer:

They must have the same slope, but different y-intercepts

Step-by-step explanation:

Slope is rise over run, or the rate of change

8 0
3 years ago
How do you solve 6x + 8= 50
Marina CMI [18]
First start by subtracting:
50-8=42
the new equation is:
6x=42
then divide:
42/6=7
So the answer is:
x=7

Hope this helps!! :D

6 0
4 years ago
Read 2 more answers
What is the mean absolute deviation of this data set, rounded to the nearest tenth?
vova2212 [387]

Answer:

The answer is C. (1.1)

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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