Square numbers between 300 and 400

Mathematics

1 answer:

Novosadov [1.4K]3 years ago

4 0

324, 361, 400

18^2=324
19^2=361
20^2=400

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Please provide steps. I have a test soon.

marishachu [46]

Answer:

B) 5x+15y=30

5x-5y=10

Step-by-step explanation:

First, we solve the top equations by addition. Multiply the first one by -4.

-4x-12y=-24

4x-8y=4

This equals -20y=-20, so y=1. Now we put that back into either equation and find that x=3. So the solution set is (3,1)

Plugging those into each of the possible choices, we find that the answer is

B) 5x+15y=30. 5(3)+15(1)=30 15+15=30. 30=30 CHECK

5x-5y=10 5(3)-5(1)=10. 15-5=10. 10=10. CHECK

6 0

2 years ago

If your starting salary is 40,000 and you receive a 3% increase at the end of every year, what is the total amount, in dollars,

liberstina [14]

$\bf \qquad \textit{Amount for Exponential Growth}\\\\
A=I(1 + r)^t\qquad 
\begin{cases}
A=\textit{accumulated amount}\\
I=\textit{initial amount}\to &40,000\\
r=rate\to 3\%\to \frac{3}{100}\to &0.03\\
t=\textit{elapsed time}\to &16\\
\end{cases}
\\\\\\
A=40000(1+0.03)^{16}\implies A=40000(1.03)^{16}$