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Nadusha1986 [10]
2 years ago
8

X − y = 12 x + 2y = 21

Mathematics
1 answer:
olga55 [171]2 years ago
5 0

Answer: x=15, y=3

Step-by-step explanation:

Subtracting the two equations, we get -3y=-9, meaning y=3.

Substituting this into the first equation, we get that x-3=12, and thus, x=15.

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Jordan invests 600 in his savings account the interest rate is $6 per year find the simple interest rate earned in 3 years. Then
aleksklad [387]
I believe you meant that the interest rate is 6%. Interest rates are given as percents.

To find the simple interest, we just multiply the principal amount by the rate and then by the number of years.

600 x 0.06 x 3 = 108

The total amount including interest will be 708.
5 0
3 years ago
Find the surface area of the prism.<br> 2 cm<br> 6 cm<br> 6 cm<br> 2 cm<br> 3 cm<br> 3 cm<br> 3 cm
Margarita [4]

Answer:Q3. 67.24 sq. ft.

Q4. 22582.88 sq. cm.

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Step-by-step explanation:

8 0
3 years ago
Select equivalent or not equivalent for each pair of expressions
marissa [1.9K]

Answer:

1: equivalent

2: equivalent

3: not equivalent

Step-by-step explanation:

for 1 & 2, you just switch the terms, but for 3, the 6z is not negative in the first expression, but it is in the second.

3 0
3 years ago
A=8, b=5, C=90 degree; Find c, A, and B<br><br> This is for the law of sine and cosine
brilliants [131]

Answer:

• c = √89 ≈ 9.434

• A = arcsin(8/√89) ≈ 57.995°

• B = arcsin(5/√89) ≈ 32.005°

Step-by-step explanation:

By the law of cosines, ...

c² = a² + b² -2ab·cos(C)

Since c=90°, cos(C) = 0 and this reduces to the Pythagorean theorem for this right triangle.

c = √(8² +5²) = √89 ≈ 9.434

Then by the law of sines (or the definition of the sine of an angle), ...

sin(A) = a/c·sin(C) = a/c = 8/√89

A = arcsin(8/√89) ≈ 57.995°

sin(B) = b/c·sin(C) = b/c = 5/√89

B = arcsin(5/√89) ≈ 32.005°

6 0
3 years ago
The table show whether a bus pass is a child’s or adult’s pass and whether it is a daily or monthly pass
PolarNik [594]

Answer:

50.8%

Step-by-step explanation:

That is the one my friend and I chose. It is 31/61 when all the stuff is added together and that is put to 50.8 as a percentage..

3 0
3 years ago
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