3 years ago

Solve this using elimination method 5x+25y=60 3x+15y=42

1 answer:

4 0

5x + 25y = 60....multiply by -3
3x + 15y = 42....multiply by 5
-------------------
-15x - 75y = - 180 (result of multiplying by -3)
15x + 75y = 210 (result of multiplying by 5)
-------------------add
0 = 30...incorrect.....this system has no solutions

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Lesechka [4]

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Step-by-step explanation:

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4 years ago

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4. If you have 15 pens which cost $0.79

katrin [286]

Answer:

The answer is 15.62

Step-by-step explanation:

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2 years ago

What is the value of the fourth term in a geometric sequence for which a1 = 30 and r = 1/2?.

Mariana [72]

$\bf n^{th}\textit{ term of a geometric sequence}\\\\
a_n=a_1\cdot r^{n-1}\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
r=\textit{common ratio}\\
----------\\
a_1=30\\
r=\frac{1}{2}\\
n=4
\end{cases}\implies a_4=30\left( \frac{1}{2} \right)^{4-1}$