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3 years ago

What is a negative number minus a negative number?

Mathematics

2 answers:

SVETLANKA909090 [29]3 years ago

8 0

Answer:

$-x-(-y) = y-x$

Step-by-step explanation:

lets say you have two negative numbers, -x and -y (x and y are positive).

$-x-(-y) = y-x$

alexgriva [62]3 years ago

8 0

Your answer is a positive number.

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-8x = 140<br><br> Solve for x

Alekssandra [29.7K]

Answer:

Explanation:

-8x = 140

Divide both sides by -8

-8x / -8 = 140 / -8

x = ⁻³⁵⁄₂

Simplify

x = -17.5

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3 years ago

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Venus is about 108 kilometers from the Sun. Saturn is about 109 kilometers from the Sun. About how many times farther from the S

alexandr402 [8]

Answer:

1017.

Step-by-step explanation:

Venus is 108.11 million miles away from the sun, and Saturn is about 109 billion. Using a calculator, I tried each of the answers until I found the correct one. Hope this helped!

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3 years ago

Nancy found that x=1 is one solution to the quadratic equation (x 2)2=a. what is the value of a?

trasher [3.6K]

The value of the a in the quadratic equation is 4.

According to the statement

we have given that the x = 1 and the given equation is (2x)^2=a

And we have to find the value of A here.

So, For this purpose, we know that the

A quadratic equation is an equation of the second degree, meaning it contains at least one term that is squared.

And the given quadratic equation is

(2x)^2 = a

we know that the x = 1 and put the value of x in it then

(2(1))^2= a

(2)^2= a

a = 4.

Now for rechecking of the value, put a = 4 in the given equation then

(2x)^2 = a

Put a = 4

Then

(2x)^2 = 4

2x = 2

And the value of x become

x = 1.

Which equal to the given value of the x which is 1.

So, The value of the a in the quadratic equation is 4.

Learn more about Quadratic equation here

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2 years ago

27 is 10% of what number?

lions [1.4K]

27 multiplied by 10 will give you the answer. 27 x 10 = 270.

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3 years ago

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Niklas takes a dose of 252525 micrograms (\text{mcg})(mcg)left parenthesis, m, c, g, right parenthesis of a certain supplement e

11Alexandr11 [23.1K]

Niklas takes a dose of 25 micrograms of a certain supplement each day. The supplement has a half life of 4 hours, meaning that 1/64 of the supplement remains in the body after each day. How much of the supplement is in Niklas's body immediately after the 12th dose? Round your final answer to the nearest hundredth.

Answer:

The amount of the supplement in Niklas body immediately after the 12th dose is 430 micrograms to the nearest hundreth

Step-by-step explanation:

Half life is the time required for an element to decay into half of its initial size.

Given that :

The supplement has a half life of 4 hours, this implies that it decay to half of its size every 4 hours.

∴ there are 6 stages of division in a day.

i.e

$\dfrac{1}{2}*\dfrac{1}{2}*\dfrac{1}{2}*\dfrac{1}{2}*\dfrac{1}{2}*\dfrac{1}{2} =\dfrac{1}{64}$

The amount of the supplement in Niklas body after the first dose (first day) can be calculated as:

= $\dfrac{1}{64}$ × 25

= 0.390625 micrograms

It is said that he used the supplement daily for 12 days (12th dose),

As such ; we can estimate the amount of the supplement that is in his body immediately after the 12th dose; which is calculated as:

amount in his body per day × number of period for complete decay

= 0.390625 × 11

= 4.296875

≅4.30 micrograms

= 430 micrograms to the nearest hundreth

The amount of the supplement in Niklas body immediately after the 12th dose is 430 micrograms to the nearest hundreth

3 0

2 years ago