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3 years ago

Can someone help? I don't understand the equasion

Mathematics

1 answer:

Alika [10]3 years ago

8 0

Answer:

a = 1/6

Step-by-step explanation:

To solve, divide both sides by 5 1/4

a = 7/8 / (5 1/4)

a = (7/8) / (21/4)

a= 7/8 * 4/21

a= 28/168

a= 1/6

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The Gordon family plans to buy a TV. One TV has a purchase price of $330 and an estimated yearly operating cost of $14. The othe

anygoal [31]

They should purchase the $369 one with the $9 plan.

330 + (14x8) =442

369+ (9x8) = 441

Hope this helps!

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3 years ago

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What's 0.14 - 0.91 ?

xxTIMURxx [149]

The solution to this problem is 0.77. You can find this answer through a math trick that always works. You should subtract the smaller absolute value from the larger absolute value of each number, and then reverse the operation if the larger absolute value is not the one you are subtracting from. In this case, I subtracted .14 from .91, and then made it negative because .91 was had the greater absolute value.

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4 years ago

Need help with math homework

Pavel [41]

Hello!

The answer for A is:

$X1=-1\\X2=5$

The answer for B is: The rocket will hit the lake surface in 5 seconds.

Defining the terms:

$a=-16\\b=64\\c=80\\$

So, replacing it in the quadratic equation (it's given to you in the exercise)\\

$x=\frac{-b+-\sqrt{b^{2}-4*a*c } }{2*a}$

$x=\frac{-64+-\sqrt{64^{2}-4*-16*80 } }{2*-16}$

$x=\frac{-64+-\sqrt{64^{2}+5120} }{-32}=\frac{-64+-\sqrt{4096+5120} }{-32}\\x=\frac{-64+-\sqrt{9216} }{-32}=\frac{-64+-\ 96 }{-32}\\x=\frac{-64+-\ 96 }{-32}\\x1=\frac{-64+\ 96 }{-32}=\frac{32}{-32} =-1\\\\x1=\frac{-64-\ 96 }{-32}=\frac{-160}{-32} =5\\$

We are working with a quadratic equation, so we will have two possible results,

$X1=-1\\X2=5\\$

Now, we are asked to find the time, time can not be a negative value, we have to discard X1 (-1) since it's a negative value, knowing that, the rocket will hit the lake after 5 seconds.

Have a nice day!

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4 years ago

Two bottles and their labels are mathematically similar.

Trava [24]

Answer:

The area of the larger label is 187.5 square centimeters.

Step-by-step explanation:

If the two bottles are mathematically similar, then the label area is directly proportional to the capacity of the bottle. If we know that a 0.512 L-bottle has a label area of 96 square centimeters, then the label area of a 1-L bottle is determined by this simple rule of three:

$x = 96\,cm^{2}\times \frac{1\,L}{0.512\,L}$

$x = 187.5\,cm^{2}$

The area of the larger label is 187.5 square centimeters.

3 0

3 years ago

Subtract -23 - 7.2 A. –30.2 B. –15.8 C. 15.8 D. 30.2

mamaluj [8]

When you a positive number from a negative number you can just add the numbers and make the sum negative.
-23 - 7.2 is like -1(23 + 7.2).
So the answer is -30.2, answer choice A.

5 0

4 years ago

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