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3 years ago

Please help me!! thank you so much

Mathematics

2 answers:

yanalaym [24]3 years ago

5 0

Answer:

B : 9 x 10

Step-by-step explanation:

So i am just going with what i think it is going on here...

4 x 10 5 : 4 x 10 x 10 x 10 x 10 x 10 = 400000 (not a perfect square)

9 x 10 4 : 9 x 10 x 10 x 10 x 10 = 90000 (a perfect square)

4 x 10 3 : 4 x 10 x 10 x 10 = 4000 (not a perfect square)

9 x 10 3 : 9 x 10 x 10 x 10 = 9000 (not a perfect square)

(sorry if i'm wrong but i hope this helped)

my i add this took me so long to multiply and stuff

Rina8888 [55]3 years ago

4 0

Answer: B

Step-by-step explanation:

I might not be right i did all the calculations in my head

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Answer:

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Step-by-step explanation:

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% Loss, if retirement taken at the age of 62 years = 25% per month

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Read 2 more answers

Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.

r-ruslan [8.4K]

Given:

The given quadratic equation is:

$12a^2+9a+7=0$

To find:

The solution for the given quadratic equation in simplest form by using the quadratic formula.

Solution:

Consider a quadratic equation is defined as $ax^2+bx+c=0$ , then the quadratic formula is:

$x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}$

The given quadratic equation is:

$12a^2+9a+7=0$

We have, $a=12,b=9,c=7$ . Using the quadratic formula, we get

$x=\dfrac{-(9)\pm \sqrt{(9)^2-4(12)(7)}}{2(12)}$

$x=\dfrac{-9\pm \sqrt{81-336}}{24}$

$x=\dfrac{-9\pm \sqrt{-255}}{24}$

$x=\dfrac{-9\pm i\sqrt{255}}{24}$ $[\because \sqrt{-a}=i\sqrt{a}]$

The solutions of the given equations are $x=\dfrac{-9-i\sqrt{255}}{24}$ and $x=\dfrac{-9+i\sqrt{255}}{24}$ .

Hence, the correct option is B.

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