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irga5000 [103]
3 years ago
13

Someone help asap!!! Will give brainlist :)

Mathematics
1 answer:
KatRina [158]3 years ago
5 0

Answer:

a) \: constant \: of \: proportionality \: (k) \\  =  \frac{90}{2}  \\  = 45 \\  \\ b) \:  \frac{distance}{time}  = k \\  \therefore \:  \frac{d}{t}  = k \\  \\ c) \: \frac{d}{t}  = k  \\  \\ \therefore \: d = tk

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Evan has a coin collection.
ahrayia [7]

Answer:

3x + 8 = 44 \\ 3x = 44 - 8 \\ 3x = 36 \\  \frac{3x}{3}  =  \frac{36}{3 }  \\ x = 12

he has 12 gold coins

4 0
2 years ago
During a sale a dress decreased in price from $60 to $48 what was the percent of decrease
Elza [17]

Answer:

The percent decrease was 20%

Step-by-step explanation:

In order to find this, use the percent change equation.

(New - Old)/(Old) * 100 = % Change

Now input 48 for the New price and 60 for the Old price.

(48 - 60)/(60) * 100 = % Change

12/60 * 100 = % Change

.2 * 100 = % Change

20 = % Change

3 0
3 years ago
Section 5.2-9. Solve the following system of equations by substitution or elimination. Enter your answer as (x,y).2x+y = 2-3x-2y
Alika [10]
\begin{gathered} (2x+y=2)\times2 \\ -3x-2y=-8 \\ 4x+2y=4 \\ -3x-2y=-8 \\ \text{subtract above two equations} \\ x=-4 \\ \text{put the value of x in equation 1st then get y} \\ 4(-4)+2y=4 \\ -16+2y=4 \\ 2y=20 \\ y=10 \\ (x,y)=(-4,10) \end{gathered}

6 0
1 year ago
Read 2 more answers
Questão 02 - Carlos e sua mãe têm juntos atualmente 47 anos. Sabendo que sua mãe ganhou Carlos aos 23 anos, a equação que repres
mariarad [96]

Answer:

x+23 = 47

Step-by-step explanation:

Let age of Carlos is x. It is mentioned that the sum of age of Carlos and his mother is 47 years old. Age of Carlos is 23.

We need to find the equation that represents the sum of Carlos' age with his mother.

x+23 = 47 is the required equation.

Also, we can find the age of Carlos as :

x = 47 - 23

= 24 years

Hence, the correct option is (B).

8 0
2 years ago
What is the solution to the system of equations?
alukav5142 [94]

Answer:

  (x, y) = (-4, 15)

Step-by-step explanation:

The two equations have the same coefficient for y, so you can eliminate y by subtracting one equation from the other. Here the x coefficient is largest for the first equation, so it will work best to subtract the second equation.

  (3x +y) -(2x +y) = (3) -(7)

  x = -4 . . . . . . . . simplify

Now, we can find y by substituting this value for x.

  2(-4) +y = 7

  y = 7 +8 = 15 . . . . . add 8 to both sides of the equation

The solution is (x, y) = (-4, 15).

6 0
3 years ago
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