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SpyIntel [72]
2 years ago
8

Yo im not good at this stuff, can someone help me?​

Mathematics
1 answer:
Kazeer [188]2 years ago
7 0

Answer:

  21 kWh

Step-by-step explanation:

1. Subtract 25% from the original amount.

  25% of 28 kWh is ...

  0.25 × 28 kWh = 7.00 kWh

Subtracting this from 28 kWh, we find the usage after reduction to be ...

  28 kWh - 7 kWh = 21 kWh

__

2. We know that if we reduce 100% of a quantity by 25%, then the resulting amount is (100 -25)% = 75% of the original. As a fraction, this is 75/100 = 3/4 of the original amount. Then the reduced usage is ...

  (3/4) × (28 kWh) = 3·(7·4)/4 kWh = 3·7 kWh = 21 kWh

__

Mario must reduce his usage to 21 kWh or less.

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HELP!! PLEASE!!! THANK YOU!!
Blizzard [7]

Answer:

C. 8x - 3y = 5

Step-by-step explanation:

7 - 3(x - y) = 5x + 2

Standard form: Ax + By = C

7 -3x + 3y = 5x + 2

7 -8x + 3y = 2

-8x + 3y = -5

Divide by -1 to each number

8x - 3y = 5

6 0
3 years ago
Which expression is equal to: H • 3
Vadim26 [7]
The answer is 3h.

Because 3h is like 3 x H
7 0
3 years ago
If we have 2 bags containing marbles. bag a has 7 green and 6 black marbles. bag b has 8 yellow and 4 red marbles. if we pick ra
Elena L [17]
A.  (7/13)·(1/3)=7/39.       P=7/39
B.  (6/13)·(2/3)=12/39.    P=12/39
C.  (7/13)·(2/3)=14/39.    P=14/39
D.  (6/13)·(1/3)=6/39.      P=6/39

All the numbers from Bag B were written as thirds cause their probabilities could be simplified to make multiplying easier
8 0
3 years ago
4. Peter participated in a 5 K race and finished the race in 17 min. A 5k race is
juin [17]

Answer: are you sure these are correct?

Step-by-step explanation:

You would calculate the speed be doing 5000 m / 17 min, which would be 294.117647059 m/min

17 minutes is extremely fast, but this is correct.

4 0
3 years ago
How do you check is the equation is a extraneous solution pr not?
vampirchik [111]

We can check the equation is an extraneous solution or not by finding the solution and plugging it in the equation, to verify it.

<h3>What is the extraneous solution?</h3>

In mathematics, an extraneous solution is a solution that comes from the process of solving the problem but is not a genuine solution to the problem, such as the answer to an equation.

As we know from the definition the extraneous solution is a solution that comes from the process of solving the problem but is not a genuine solution to the problem.

Let's suppose the equation is:

\rm \sqrt{x+4} = x -2

Squaring both the sides:

x + 4 = (x - 2)²

x + 4 = x² - 4x + 4

x² -5x = 0

x = 0 or x = 5

Checking for the solution by plugging in the equation;

\rm \sqrt{5+4} = 5 -2

3 = 3

\rm \sqrt{0+4} = 0 -2

2 ≠ -2

The solution x = 0 shows extraneous solution.

Thus, we can check the equation is an extraneous solution or not by finding the solution and plugging it in the equation, to verify it.

Learn more about the extraneous solution here:

brainly.com/question/14054707

#SPJ1

6 0
2 years ago
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