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2 years ago

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Mathematics

1 answer:

Inga [223]2 years ago

4 0

Answer:

Average speed is 3 kilometers an hour

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If you are heading off to college discuss who will be paying for it, where you will live, what your intended major will be, and

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3 years ago

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$ax^2+bx+c=0\\\\x_1=\dfrac{-b-\sqrt{b^2-4ac}}{2a};\ x_2=\dfrac{-b+\sqrt{b^2-4ac}}{2a}$

$We\ have:\\\\15x^2+7x-12=0\\\\a=15;\ b=7;\ c=-12\\\\substitute\\\\x_1=\dfrac{-7-\sqrt{7^2-4\cdot15\cdot(-12)}}{2\cdot15}=\dfrac{-7-\sqrt{49-5(15)(-12)}}{30}\\\\x_2=\dfrac{-7+\sqrt{49-4(15)(-12)}}{30}$

First option.

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3 years ago

I WANT SOLUTION AND EXPLANATION ANSWER IS GIVEN AT LAST!!!

Pavel [41]

<h3><u>Question:</u></h3>

The present ages of Ram and Rehman are in the ratio 8:9. After 5 years, the ratio of their ages will be 9:10. Find their present ages.

<h3><u>Statement:</u></h3>

The present ages of Ram and Rehman are in the ratio 8:9. After 5 years, the ratio of their ages will be 9:10.

<h3><u>Solution:</u></h3>

Let the present age of Ram and Rehman be 8x years and 9x years respectively.
After 5 years, their ages will be 9x years and 10 years respectively.
Therefore, by the problem

$\frac{8x + 5}{9x + 5} = \frac{9}{10} \\ = > 10(8x + 5) = 9(9x + 5) \\ = > 80x + 50 = 81x + 45 \\ = > 50 - 45 = 81x - 80x \\ = > x = 5$

So, the present age of Ram = 8x years = (8×5) years = 40 years
The present age of Rehman = 9x years = (9×5) years = 45 years

<h3><u>Answer:</u></h3>

The present ages of Ram and Rehman are 40 years and 45 years respectively.

3 0

2 years ago

the price of silver has increased by 15% per year from 2000. in the year 2000, harry bought a silver bowl for $190. which of the

lesya [120]

<h2>Answer</h2>

f(x) = 190(1.15)x

<h2>Explanation</h2>

To solve this, we are going to use the standard exponential function:

$f(x)=a(1+b)^x$

Where

$f(x)$ is the final price after $x$ years

$a$ is the initial price

$b$ is the rate in decimal form

$x$ is the time in years

We know from our problem that the initial price is $190, so $a=190$ . Now to convert the rate, 15%, to decimal form, we are going to divide it by 100%, so $r=\frac{15}{100} =0.15$ . Let's replace the values:

$f(x)=a(1+b)^x$

$f(x)=190(1+0.15)^x$

$f(x)=190(1.15)^x$

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3 years ago