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Sergeu [11.5K]
3 years ago
12

Need help solving the review questions #1&2

Mathematics
1 answer:
tankabanditka [31]3 years ago
4 0

Answer:

Step-by-step explanation:

1)-2x+8=-3x+14

-2x=-3x+6

x=6

2) (-2)^2-3*5+12

4-15+12

=1

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We’re calculating perimeter, so we add up the length of all 4 sides, or multiply (l + w) x 2. Since the room is square, we only need the one measurement.

11.4 x 4 = 45.6 feet

5 0
3 years ago
La temperatura de un congelador bajó de 3 °C a −9 °C en 3 horas. Si la temperatura del congelador bajó en la misma cantidad de g
kolbaska11 [484]

Usando proporciones, se encuentra que al final de la primera hora, el congelador tenía una temperatura de -1ºC.

  • Este problema se resuelve por proporciones.
  • En 3 horas, la temperatura bajó 12ºC, puesto que 3 - (-9) = 12.

La temperatura del congelador bajó en la <u>misma cantidad de grados cada hora</u>, o sea, en la primera hora, la cantidad que bajo es:

\frac{12}{3} = 4

4ºC bajo a 3ºC es:

3 - 4 = -1

O sea, al final de la primera hora, el congelador tenía una temperatura de -1ºC.

Un problema similar es dado en brainly.com/question/24617308

3 0
3 years ago
If 5 workers can pave 10 driveways in 30 days, how many days would it take 20 workers to pave 38 driveways?
mel-nik [20]

5*30/10 = 20x/38

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6 0
3 years ago
PLEASE HELP
Lemur [1.5K]

1. y=6

2. y=-12

Step-by-step explanation:

<u>1) If y varies inversely as x, and y=3 as x = -2, find y for the x value of -1.</u>

It is given that

y varies inversely as x

IT will be written as:

y∝1/x

Removing the proportionality symbol

y=k/x

Given

y=3 , x=-2

Putting the values

3=k/-2

k=3*-2 = -6

The equation will be:

y=-6/x

So,

When x=-1

y=\frac{-6}{-1}\\y=6

<u>2) If y varies directly as x, and y=15 as x=-3, find y for the x value of 4</u>

y is directly proportional to x

y∝x

y=kx

Given

y=15, x=-3

Putting the values

y=kx\\15=-3k\\k=\frac{15}{-3}\\k=-5\\The\ equation\ will\ be:\\y=-3xNow,\\x=4\\y=-3(4)\\y=-12

Hence,

1. y=6

2. y=-12

Keywords: Proportion, Variation

Learn more about proportion at:

  • brainly.com/question/5009365
  • brainly.com/question/5013374

#LearnwithBrainly

8 0
3 years ago
How is 10+10 the same as 11+11?
lbvjy [14]
The answers are overall different. But there are similarities. Both equations have an addition sign. Both also have double digit numbers being added together.
7 0
3 years ago
Read 2 more answers
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