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777dan777 [17]
3 years ago
7

If 4.5x+2y=7, and 9x+4y=z, what is the value of z?

Mathematics
1 answer:
GrogVix [38]3 years ago
4 0

Answer:

Step-by-step explanation:

X= Z-4y =9

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Petro was given this system of equations. -14x-2y=24 14x+8y=-12
Svetllana [295]

Pedro made mistake in step 3.

He supposed to plug in y = 12 into the y in the equation to solve for x

Should be:

-14x - 2(2)=24

-14x - 4 = 24

-14x = 28

    x = -2

4 0
3 years ago
In class of 30 student, 10% of the students are male. How many female students are in class?
MakcuM [25]

Answer:

27 females are in the class

Step-by-step explanation:

Spilt 30 into 10 (30 divided by 10) and then you get 3. The number of males in the class is 3. Now subtract 30 from 3 and you get 27. Therefore, there are 27 females in the class.

8 0
3 years ago
Find the gcf 21 28 140
marshall27 [118]
The greatest common factor is 7.
5 0
3 years ago
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Jacque needs to buy some pizzas for a party at her office. She's ordering from a restaurant that charges a $7.50 fee and $14 She
zloy xaker [14]

Answer:

The answer is 24

Step-by-step explanation:

If the restaurant fee is $7.5 and the price is $14 per pizza, she has $52.5 to spend on the pizzas after we deduct the restaurant fee.

That means she can get 52.5 / 14 = 3.75 pizzas.

  • Since she can't get .75 pizza, we can assume that she will order 3, which in total makes 8 x 3 = 24 slices.
  • If she can however order 3.75 pizzas, .75 x 8 makes 6 slices so it is a total of 30 slices for 3.75 pizzas.

I hope this answer helps.

6 0
3 years ago
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Two tanks hold a total of 39 gallons of a toxic solvent one tank holds 3 gallons more than twice the amount in the other how man
diamong [38]
2x + 3 + x = 39
3x + 3 = 39
3x = 36
x = 12

One tank holds 12 gallons
The other tank holds 27 gallons
6 0
2 years ago
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