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docker41 [41]
2 years ago
7

The table shows the results when two coins are tossed 500 times.

Mathematics
1 answer:
Delicious77 [7]2 years ago
3 0
A 25% it is right I believe
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Solve the system of equations using the substitution method.
Karolina [17]
Substitution is where we first Isolate one of the unknowns, express it in terms of the other unknown, and replace the isolated unknown with the other unknown in another equation. So that each time we only need to deal with one unknown. I think you'll get a better idea here:

First name these 2 equations with 1 and 2.
4x + 5y = 7 (1)
y = 3x + 9 (2)

Since y is already isolated in (2), so we can skip the isolation step and continue to substitute.

Substitute (2) into (1).
4x + 5(3x+9) = 7

Expand.
4x + 15x + 45 = 7

Group.
19x + 45 = 7

Shift +45 to the other side and turn it into -45.

19x = 7 - 45
19x = -38

Shift x19 to the other side, turn it into /19.
X = - 38/19
X = - 2

Now we solved x already, we can just substitute x= - 2 back to equation (2).

y = 3(-2) + 9
y = - 6 + 9
y = 3

So, the answers are
x = - 2
y = 3
3 0
2 years ago
If hoan was asked to drow a right angke how miny right agnkes are in a right angle
krek1111 [17]

I might not understand this correctly because of the misspellings, but if you draw a right angle. There is only 1 right angle... in a right angle.

4 0
3 years ago
Help me with factor trees pls it’s timed <br> There is a photo if u click
oksano4ka [1.4K]

Answer:

                        28

                  4             7

           2             2

here it is, hope it helps :)

3 0
2 years ago
.02, 0.2, ___, 20, ___, __<br> What's the pattern?
Bingel [31]
You are multiplying by 10 each time so it is:
.02, 0.2, 2, 20, 200, 2000
7 0
3 years ago
A certain brand of coffee comes in two sizes. A 12.3-ounce package costs $2.99 . A 33.9-ounce package costs $8.74 . Find the uni
aalyn [17]

Answer:

12.3 - 33.9 = 21.6 \div 10 = 2.16

7 0
2 years ago
Read 2 more answers
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