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rjkz [21]
3 years ago
15

Five years ago a girl was one-half as old as her brother was then, and now she is three years younger than he is. What are their

present ages?
A) girl is 7; brother is 10

B) girl is 8; brother is 11

C) girl is 9; brother is 12
Mathematics
2 answers:
podryga [215]3 years ago
7 0
The girl is 8 and her brother is 11


Aloiza [94]3 years ago
3 0
The answer is B because they would have been 3 and 6.
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Please help
Zolol [24]

Given:

The function is

r(x)=0.05(x^2+1)(x-6)

where, function r gives the instantaneous growth rate of a fruit fly population x days after the start of an experiment.

To find:

Number of complex and real zeros.

Time intervals for which the population increased and population deceased.

Solution:

We have,

r(x)=0.05(x^2+1)(x-6)

r(x)=0.05(x^3+x-6x^2-6)

Here, degree of function x is 3. It means, the given function has 3 zeros.

From the given graph it is clear that, the graph of function r(x) intersect x-axis at once.

So, the given function r(x) has only one real root and other two real roots are complex.

Therefore, function r has 2 complex zeros and one real zero.

Before x=6, the graph of r(x) is below the x-axis and after that the graph of r(x) is above the x-axis.

Negative values of r(x) represents the decrease in population and positive value of r(x) represents the increase in population.

Therefore, based on instantaneous growth rate, the population decreased between 0 and 6 hours and the population increased after 6 hours.

3 0
3 years ago
Factor completely x2 + 25
Ganezh [65]

Answer:

(x - 5i)(x + 5i)

Step-by-step explanation:

Write this as x^2 + 25.  Solving for x^2, we get x^2 = -25.

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Then x = ±5i.

In factored form, the given expression is (x - 5i)(x + 5i).

6 0
3 years ago
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