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3 years ago

I really need help and pls plsss show ur work so I can understand

Mathematics

2 answers:

padilas [110]3 years ago

8 0

<h2>Answer:</h2>

-3.8x + 7 and c = -75/14 and/or c = -5.35714

<h3 /><h2>Step-by-step explanation:</h2>

<em>First equation: </em>

1.2x + 7 - 5x =

Step 1 - Group like terms:

1.2 - 5x + 7

Step 2 - Add simliar elements:

1.2 x - 5x = -3.8x =

3.8x + 7

Answer: -3.8x + 7

<em>Second equation:</em>

2.2c - 3 = 2(6 - c) + 7c =

Step 1 - Multiply both sides by 10:

2.2c ⋅ 10-3 ⋅ 10 = 2(6 - c) ⋅ 10 + 7c ⋅ 10

Step 2 - Refine:

22c - 30 = 20(6-c) + 70c =

<em> - Expand 20(6-c): 120 - 20c</em>

22c - 30 = 120 - 20c + 70c

Step 3 - Add similar elements:

-20c + 70c = 50c =

22c - 30 = 120 + 50c

Step 4 - Add 30 to both sides:

22c - 30 + 30 = 120 + 50c + 30

Step 5 - Simplify:

22c = 50c + 150

Step 6 - Subtract 50c from both sides:

22c - 50c = 50c + 150 - 50c

Step 7 - Simplify:

-28c = 150

Step 8 - Divide both sides by -28:

-28c/-28 = 150/-28

Step 9 - Simplify:

c = -75/14

Answer:

Fraction form: c = -75/14

Decimal form: c = -5.35714

<em>Hey! Your question wasn't quite clear, so the most I could do was simplify both equations in a way you can hopefully understand. If these aren't the answers you were looking for, please elaborate on what I was supposed to answer!</em>

Vika [28.1K]3 years ago

4 0

Answer:

2. 3/2 = 1.5. 3. 7. 5. 7/5 = 1.4. 4. 17. 12. 17/12 = 1.416666. 5. 41. 29. 41/29 = 1.413793. 1.3(c) 1.7(c). let P2k = Xk and q2k = 2Yk.

Step-by-step explanation:

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6 0

3 years ago

I don’t understand this

tatyana61 [14]

9514 1404 393

Answer:

f⁻¹(x) = √((3 -x)/3)

Step-by-step explanation:

A function gives you a y-value for each value of x.

y = f(x)

An inverse function tells you the x value that produced a given y-value. It is the solution to the equation ...

x = f(y)

So, we want to find y for ...

x = -3y² +3

x -3 = -3y² . . . . . . . . . . . subtract 3

(x -3)/-3 = y² . . . . . . . . . divide by -3

√((x -3)/-3) = y . . . . . . . take the square root.

The requirement for x > 0 in the original function means y > 0 for the inverse function. That is why we use the positive square root.

This can be simplified a little bit to remove the minus sign from the denominator.

f⁻¹(x) = √((3 -x)/3)

The graph plots the function and its inverse. They are reflections of each other over the line y=x. (That's one way you can tell you have the correct inverse function.)