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Law Incorporation [45]
2 years ago
15

Find the value of two numbers if their sum is 21 and their difference is 5

Mathematics
1 answer:
kykrilka [37]2 years ago
6 0

Answer: x = 13 and y = 8

Step-by-step explanation:

Two numbers must add to 21. We don't know them yet, so let's just use a placeholder for both of them for now.

x + y = 21

Their difference is five, meaning that if we subtract one from the other, we get five. Again, we don't know the numbers yet, so we'll add a placeholder for now.

x - y = 5

We can now solve a system of equations for x.

x = y + 5

y + 5 + y = 21

2y + 5 = 21

2y = 16

y = 8

x - 8 = 5

x = 13

So x = 13 and y = 8

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Which statement is correct?
Arisa [49]

Answer:

2.06 \times 10^-^2 = 206

1.88 \times 10^-^1 = 18.8

206 \times 18.8 = 3,872.8

7.69 \times 10^-^2 = 769

2.3 \times 10^-^5  = 230,000

=\frac{769}{230000}

= 0.00334

therefore,

3,872.80 > 0.00334

Step-by-step explanation:

Which statement is correct?

(2.06x102x1.88 x 10-1) <7.69x 10

2.3x10-5

(2.06 x 10-2)(1.88 x 10-1) 7.69x 10-

2.3x10-5

7.69 x 10"

(2.06 x 10-2x1.88x10-)>

2.3x10-5

(2.06x 10-2X(1.88x 10-1)-7.69x104

2.3x10-5

Given that;

2.06 \times 10^-^2 = 206

1.88 \times 10^-^1 = 18.8

206 \times 18.8 = 3,872.8

7.69 \times 10^-^2 = 769

2.3 \times 10^-^5  = 230,000

=\frac{769}{230000}

= 0.00334

therefore,

3,872.80 > 0.00334

7 0
3 years ago
You want to build supports at each end of a table in the shape of a triangle. What type of triangle would you use to act as the
german

right angle because its always perpendicular to the floor

8 0
3 years ago
Planet X is 1/2 of a light-year away from Earth. Planet Y is 3/10 of a light-year away from Earth. How much farther away is Plan
kakasveta [241]

Answer:

1/2= 5/10

5/10 - 3/10 = 2/10 or 1/5

so planet X is 1/5 of a light-year closer

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
How many hours does it take to get 5 miles?
Dmitry_Shevchenko [17]

Depends on MPH or Miles Per Hour.

Going 10 mph = 30 minutes

Going 50 mph = 10 minutes

Etc.


8 0
3 years ago
It takes buddy 15 minutes to make a halfway decent looking origami swan and Ambrose 20 minutes to do the same. Working together,
Elanso [62]
It would take them 25 minutes
4 0
3 years ago
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