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3 years ago

if a population doubles every 5 years how many years would it take for the population to increase by 10 times original amount?

Mathematics

1 answer:

Alecsey [184]3 years ago

7 0

25 years is the answer

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Use the quadratic formula to solve x - 5x+3 = 0.

antoniya [11.8K]

Answer:

(D) $\begin{array}{*{20}c} {x=\frac{{ 5 \pm \sqrt {13} }}{{2}}} \end{array}$

Step-by-step explanation:

The quadratic formula is:

$\begin{array}{*{20}c} {\frac{{ - b \pm \sqrt {b^2 - 4ac} }}{{2a}}} \end{array}$

Assuming that a is our x² term, b is our x term, and c is the constant, we can substitute inside the equation.

$\begin{array}{*{20}c} {\frac{{ - (-5) \pm \sqrt {5^2 - 4\cdot1\cdot3} }}{{2\cdot1}}} \end{array}$

$\begin{array}{*{20}c} {\frac{{ 5 \pm \sqrt {25 - 12} }}{{2}}} \end{array}$

$\begin{array}{*{20}c} {\frac{{ 5 \pm \sqrt {13} }}{{2}}} \end{array}$

So the answer is D, $\begin{array}{*{20}c} {x=\frac{{ 5 \pm \sqrt {13} }}{{2}}} \end{array}$ .

Hope this helped!

3 0

3 years ago

Make a the subject of the formula: T=a+4

WINSTONCH [101]

Let's solve for a.

t=a+4

Step 1: Flip the equation.

a+4=t

Step 2: Add -4 to both sides.

a + 4 + −4 = t + −4

<u>Answer:</u>

a=t−4

6 0

3 years ago

Which expression is equivalent to 8-(6r+2)?

kenny6666 [7]

Answer:

6(1-r)

Step-by-step explanation:

8-6r+2

=6-6r

=6(1-r)

5 0

2 years ago

PLEASE HELP ASAP

kotykmax [81]

Answer:

A. 9π/2km

Step-by-step explanation:

the length of the arc is

s= angle in radians* radius

the angle in radians

135 = 3π/4

therefore length of arc

s= (3π/4)*6 = 9π/2km

8 0

2 years ago

The graph of g(x) = (1/2)^x is the graph of f(x) = 2^x reflected over the y-axis. Which graph represents g(x)?

Dominik [7]

Answer:

eflect across y axis means that you replace x with -x

f(-x)=2(-x)=-2x

g(x)=-2x

de graph is the one that passes through (0,0) and (1,-2) and -1,2)

Step-by-step explanation:

4 0

3 years ago