3 years ago

A certain number added to its square is 30. Find the number

Mathematics

1 answer:

Alex Ar [27]3 years ago

5 0

X+x²=30
x²+x-30=0
(x+6)(x-5)=0
x=-6 or x=5

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An investment declines in value by 3% each month. By what percentage does its value decline in a year ?

babunello [35]

$\bf \qquad \qquad \textit{Annual Yield Formula}
\\\\
~~~~~~~~~~~~\left(1+\frac{r}{n}\right)^{n}-1
\\\\
\begin{cases}
r=rate\to 3\%\to \frac{3}{100}\to &0.03\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{monthly, thus twelve}
\end{array}\to &12
\end{cases}
\\\\\\
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3 years ago

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kondaur [170]

Answer:

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Step-by-step explanation:

-3(x+2)² + 7

-3(x+2)(x+2) + 7

(-3x-6)(x+2) + 7

-3x² - 6x - 6x - 12 + 7

-3x² - 12x - 5

7 0

3 years ago

3x+5=23 what is the value of x?

Juliette [100K]

Answer:

x = 6

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Select the system of linear inequalities whose solution is graphed.

elixir [45]

Answer:

$y\geq 3x-1$ ; $x+3y\leq 6$

Step-by-step explanation:

we know that

step 1

Find the inequality of the solid line x+3y=6

The solution is the shaded area below the solid line

therefore

The equation of the inequality is

$x+3y\leq 6$

step 2

Find the inequality of the solid line y=3x-1

The solution is the shaded area above the solid line

therefore

The equation of the inequality is

$y\geq 3x-1$

therefore

The system of linear inequalities is

$y\geq 3x-1$ ; $x+3y\leq 6$

5 0

3 years ago

The pattern for the kite calls for 169 square inches of fabric. What is the

lys-0071 [83]

Answer:

13 inches.

Step-by-step explanation:

Square root 169 and you will get the answer 13. Hope this helped.

3 0

2 years ago